And I will bring a Dremel tool with assorted bits for fixing the problems with FP20 and LA46 engines.
None of this high-falutin motorized crap, it's a rat-tail file and a yardstick for me. Bunch of eggheads.
Zona Saws, and lots of glue, might be appropriate, however. David, Ted, and I have a pretty good heritage of making design modifications in the field. Check out David's 1997 NATs winner some time, and you will see 4-5 slots we cut in the rudder/fin with a zona saw out in the middle of a field in the blazing NAPA sun. The ARF Strega really was a coarse wood rasp, because whatever hardwood they use for the LE is really tough stuff!
One of the things that can absolutely cripple these sorts of efforts it the "I'll just build another one" phenomenon, where people want to go try to build an entire new airplane rather than to just fix the one they have, right then and there. Everyone should be prepared to change whatever might be changed, right now, before your next flight, because we don't have these events often enough to take it home and fix it in between sessions
Brett