Even though I don't have the paint situation figured out yet, I figured I'd get the prep work out of the way today. First I blew out all the drill shavings and little bits of crud, then vacuumed out the fuselage interior. After that I cleaned the inside and outside of the fuselage with dish soap and water.
I can't believe I went to the trouble of taking a picture of a bucket of dirty water and posting it on the internet. Anyway, after thoroughly drying the interior with shop towels and then vacuuming the interior again, I started masking off stuff I don't want to get paint on. Here's the firewall:
Center section:
I didn't bother masking off the underfloor area in the baggage compartment, but I did cover over the pushrod tunnel and flap weldment.
I closed up the baggage bulkhead so I can paint the visible areas without blowing a bunch of paint back into the tailcone.
All of the above looks simple in theory, but it took several hours of uncomfortable leaning into the fuselage and messing around with little bits of tape. When all that was done, I covered the wings in shrinkwrap so they'd stay fresh longer. Actually this is a plastic dropcloth to catch overspray.
Okay, I'm ready to paint. Now I just need to find out if I'm going to be able to actually find some paint…