The storm passed last night, but by the time it did, it was almost 10.30pm I only had time for a quick build before bed, no time to actually post it here.
I'll still show you, just in case you want to go back and give it another try.
Before you do anything, go to the roof tool and turn of the auto roof (really wish this was off by default)
Build you basic shape.
Extend the side walls to the same point as the front and back point.
Go up a level and add walls and a floor, then remove the walls.
Use the high gable roof tool and put a roof over the middle section with straight side walls.
Now use the same tool to add a roof to the ends (we need to do it in parts to get the walls
Remove the extended walls on the ground level and also the wall at the end of the gable roof
to make it look a bit better, add a collumn on top of the point bit. Also add a bit of floor above the collumn so the collumn doesn't look like it's supporting nothing
Then just repeat for the other end.
That's probably the best you can do with the game limitations. Once done, you can add windows and doors to the lower angled walls, plus you can use the move objects cheat to add windows to the top wall.
Hope that's a little bit helpful
Norma