So first, the cutaway. Extremely easy. After fitting the neck block, hack a big chunk out of the upper bout from the neck block to the widest part of the upper bout and flip it over. Glue it up to the neck block, make a stick shaped to the angle you want to join the side at and glue that up. Done. See pics...
Neck. Surprisingly not that difficult. Surprisingly time consuming. 2 days of sanding and shaping with 80 grit and a lot of sweat. A little more difficult than it had to be as my body shape was not symmetrical where the neck joins. See pic above that shows the body alignment contrasted with the frets. See how the body is higher on the right side of the fretboard? So I had to shape the neck heel to get it right. I just double sided taped the body on a centerline scribed on my $6 Ace hardware shelf that i used for a flat surface and slipped the neck up to the body on that centerline and kept sanding until it fit pretty good.
Instructions say put the fretboard on before attaching the neck. DON'T do that. The top of the body and the top of the neck are both flat making alignment (on one axis at least) easy. Shape the neck to the fretboard before attaching to the body, but leave the fretboard off to make attaching it easier.
Finish. I used Tung Oil. 2 coats. Easiest finish I've ever applied. Wipe on, wipe off. Let dry, buff with 0000 steel wool. Done.
Things I did wrong that you don't have too...
Don't drill the holes for the dowels too deep!
Drill a pilot hole! Enlarge, then drill the final hole. I used a punch but still had to contend with some pretty serious drill drift.
The nut that comes with the kit is like a skyscraper. Don't get overzealous when lowering it. (Now I have to make a new one cause there's a little buzz on the open A string)
Don't attempt to use a dremel or other power grinder on the fret ends. They will get hot and burn the fretboard. Use a hand file!
Keep your work area clean! Can't really see them in the pics, but there are lots of little micro scratches on the body from teeny wood chips that got under it when sanding and such. Mahogany is very soft.
Things I did right that you should do...
Dry fit everything several times and practice clamping with no glue. When it comes to the real thing, it'll be easy.
Get a plastic head hammer for the fretting.
Always use a block of some sort when sanding. Use a dowel for the inner bends. Never sand with your fingers.
Sand until you can't sand anymore, then pick up the block and keep sanding until your arms fall off, then sand with your feet.
That's it. Hope this helps someone.