I invented a greenbunker!
Mom would never be happy with that!
I am not saying that she will ever be happy, but I did the back, too:
Yeah... um... yeah. She's not going to be happy with this!
Trimming the roof was easy, I just climbed up, placed my knife in a corrugation just outside of the siding, and it cut straight on its own--until the top of the second one.
I didn't trim the corner piece, so it stuck, and I trimmed around that, before trimming the corner mistake.
Is anyone keeping track of my mistakes?

Sixteen-inch studs on-center, measuring before I installed the siding, and trimming the corner before trimming the roof.
I ended up having a gap where I cut around the corner, so I used the largest remaining piece, and, yeah...
Yeah.
My math had never felt right and I made the absurd mistake of not halving the remainder after cutting the angle.
I used a 10' 2x6 and drew a line according to my math, but it was clearly wrong, and I realized my mistake.
Since I have done an atrocious job of cutting angles I wanted to use my jigsaw, but I couldn't find it, so I lined up the 2x4 under the sheet, and the 2x6 on top, half an inch over. It worked great except when I was past the end of the 2x4.
Tomorrow I will screw 1x2s around the door and door frame and figure out a door handle.