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I would turn off auto foundation and run BUILD FOUNDATION in plan view while on first floor. Then go down to 0 floor and see what happened. MAke sure you have FOUNDATION layer and maybe footings turned on in LAYER DISPLAY OPTION

how did you build foundation? Should use the BUILD FOUNDATION button.

what do you want it to be? Siding right? Well many ways one I like is take the Eyedropper thingy and use it to click on siding you want applied to this dormer say the siding on first floor. after you click it turns into a spray can. Spray the siding of the dormer and it will change to what you click on with eyedropper. Use HELP command to learn more on this feature.

Have you tried POST to BEAM? not looking at anything but normally if you have posts holding up something there will be a beam above it and normally, they are located like headers. Might be 2 2x12s or a laminated type beam all depends on the post spacing. Might give you what you want and it adds the beam which has to go below rafters anyways.

maybe bring the right rectangular window closer to the arched one.

ceiling joists are different then 2nd story floor joists. Floor joists act as ceiling joists, but Ceiling joists DO NOT support floor above. So go to defaults and check what you have. If you look at your picture you can see where it shows the CEILING truss as 16 but the 2nd story floor joists are difference of 156.625 - 144 = 12.625" See below where you set them up in default Ceiling & Floor 2 framing materials on 1st floor tab.

Well When I draw them I go inside room and draw a smaller room using room divider for walls then and ensure you enclose a space to make another room. Then inside this room click it so you can edit room details Go to structure page and change ceiling height to whatever you want it to be inside the tray area. I tend to go based on heights of lumber required for span so 11.25" (2x12) higher than room you created this Fake room. Now my method creates vertical "wall" inside the tray area where you drew cathedral ceiling to get to the tray ceiling height. So fo yours you could do the same thing but might have to make another Fake room inside that one. So this other fake room represents the Flat ceiling portion. Then the "Ring" one that is under the "Cathedral" ceiling portion edit room structure page and UNCHECK flat roof and then the ceiling will go be sheetrock under rafters. Not sure what it will do on inside portion where the rafters will be well above. So maybe make ceiling planes for this slanted portion as you know the base and the "ridge" heigh from the normal room ceiling would be base height and the tray small portion ceiling height would be the ridge height. Have to play with it to see what gives you what you want.

need to select room. then click EDIT button. Thengo to STRUCTURE TAB There you will find CEILING info and button to turn off

also your roof pitch in model do not look like those in picture. drawing look steeper more like 12/12 where picture looks like 4/12

So you want to extend porch in front by covering sides with a flat roof? USe a manual roof plane and set pitch to 0.

DId you try by changing DEFAULT FRAMING member size for rafter? Then go to BUIILD FRAMING Then SELECT BUILD FRAMING ONCE Then check ROOFS Then hit OK and see what happens? Pretty sure that is 2024 edition I know it is my 2025. BUT Rafters located based on Wall Top Plate and normal birds mouth so rafter tops will be elevated. Also are you getting spray foam under roof deck? as normal insulation is in Ceilings or Ceiling Joist bays unless you want conditioned attic and then normal avenue is spray foam which requires less depth for same R as Fiberglass bat.

WHY? They have realistic grass to cover top surface and look real... who needs to see cross section of earth for building a house?

what type of room did you make stairwell? ON second floor it should be "OPEN BELOW" check roof over & flat ceiling. on first floor can be anything. I set mine to HALLS check roof over & flat ceiling. but I think your problems area easily solved with update to pro and you manually edit roof planes. But I say that because I find it easier to just do the auto roof and then edit planes to what I want if not correct. Trying to figure out why it does goofy roof things can be a pain so I just prefer to edit them planes

not sure this software is setup to do what you want without making each sheet individually. Normally in floor heating uses a plastic panel with "PEGS" sticking up and grooves on all 4 sides. Schluter®-BEKOTEC | Modular Screed Systems | Schluter You glue it down and then lay floor heating piping in it. Reason for pegs is you can install in whatever pattern you want. Old days they had a special plank with aluminum on top for piping to snap into and plywood glued to back. very pricey and labor intensive. I suggest googling it to see what is available and best for your project this plywood thing would be expensive as you have to pay someone to machine groove and it has tobe thick enough for tubing to be below top.

Many ways. kind of depends on size and construction. Yours actually look like a normal column maybe made from 4 4x posts in corners then conencted with sheathing and then covered in Stucco. I would make a new wall definition by copying the STUCCO 4" stud one and just removing sheetrock from interior surface. Then make a small room with exterior stucco dims matching your 16x16. It will make a room can you can call it UNKOWN type. ANother way is to make it a slab 16x16 w/footer and make thickness whatever itneeds to be to hit structure above be it 97.5" or 107.25 etc. Then yet again look in columns for one might be stanard ones do not have what youhave but maybe they have library for sale that does. Another way is make it from 3D shape. I bet there are 3-5 more ways to make it - get creative and what works best for you.