Well, I got the Sustainer installed. I modified the control cavity a little bit; I removed the top-center screw support wood (see photo) to add a little room. I ordered the body with the 5-way switch and middle pot configuration, since I do that on all my orders. If I had a redo, I'd probably have just gotten the switch done, to give myself more flexibility.
The only 'problem' I encountered is that the top is a little too thick for the switches. I have just enough thread out the top to get the nuts on (oh stop it...), and since this thing isn't going on any world tours, I bet I'm safe. If I ever get really bored, I will remove all the guts and rout the top to the same thickness as the area for the switch. But I'm in no hurry.
Oh, and make sure you get the biggest input jack hole possible. I got mine drilled for 7/8" and still had to go larger because of the Fernandes jack. It was pre-wired, so I figured I'd rather rout than switch.
But this thing is sweeeeeeeeeeeeeeeeeet

arty07: