I cut out the first profile today, which was exciting.
I traced the pattern on using a sharpie, and then cut along the line with a
scroll saw. I was about 20" into my practice cut when the original Craftsman blade that came with the machine snapped. I replaced it with a Bosch blade, which worked much better and got me through the entire cutout plus the door. The dude at the hardware store advised me to take it nice and slow, which I think helped.
Afterwards, I used an
orbital sander with a 60-grit plate to smooth out any wobbles, which worked pretty well.
It's not impeccable, but I
think it will get the job done. (Unless anyone sees any red flags?)
I also
cut the door out, and I'm kind of wishing I had waited on that. My next steps (after cutting out profile #2) will be to construct the trailer frame and build the floor--it will be a little while before I need the walls. And now that the door is cut out of the profile, it feels awfully fragile along the bottom. I'm thinking of tacking a scrap piece of plywood along the bottom to give it a little extra strength until it's time to install the exterior walls.
The door, as a side note, was a
fiddly pain. I think it will be fine, but it was much wobblier than the edge of the profile. I cleaned it up a bit with the sander again, but that didn't work as well on the tight curve of the door. Again, I think it will work what with the trim and gaskets and hinge--the wobbles were small--but poetry in plywood it ain't. Credit to Mr P for getting the door started, BTW--he worked some freestyle magic with a circular saw to open up a path for my scroll saw.
Here's the documentation. BTW, my phone's camera makes the
perspective all screwy--it looks like the door is smack in the middle of the profile, but it's actually about 3' from the front and 5' from the back--right where the plans say it should be, leaving plenty of room for the fender and interior shelf. (I panicked when I saw the pic and re-measured everything.)
The Edge (minus Bono, haha):

The whole thing, sans door. Remember, the camera has jacked with the perspective!

Lastly, in the category of
"Why Don't I Do What People Tell Me?" I got some advice to make a masonite or similar template instead of cutting directly into the final product, but I wasn't convinced that it would be worth the extra $$$ and time. I'm realizing now, though, that I'm going to have to cut out the interior walls soonish--before I
install the exterior walls--since I'll be using the profile as a template. Which means I'll have the interior walls just hanging around the garage, warping, long before I actually need them. To other newbs--it's not a big deal, but I kinda wish I'd gone with a masonite template. Just FYI.