Shed Roof for simple pole structure: Pole height problem

[Bcavender]

I am trying to create a rough drawing to give to a pole barn builder for a basic, shed metal roof on poles without sides.

 

I used build railings and 'post to ceiling' which worked in the front, but in the middle and back, the posts stop at the front ceiling height even though a flat ceiling was deleted.

 

Is there a way to define the middle/back ceiling heights to make the posts go all the way up ... or is there a better way to approach doing this?

 

All comments/suggestions welcome!

Thank you!

Best regards,

Bruce

[solver]

I'd use something like a soffit or slab for the poles. Don't know an automated way to do this.