Well I'm not Bob, but maybe this might be a solution for reinforcing the gear doors.
It's acutally called G10 and it's computer component board stuff, but if you buy it that way it comes in 3'x4' sheets...
BVM will sell it to you in smaller pieces and it's available in three thicknesses.
BVM suggests it's used specifically for gear doors as well as other things. I used the .020 thickness to build some cowl bafflling for a ZDZ-100 twin that's in my 33% Edge and it's great.
As for cutting the fiberglass I think you're right about the bandsaw, but a whiz wheel is tuff to cut a straight line and what about the angles on the forward part of the doors?
A whiz wheel would work to cut out the outsides of the doors since you can sand them straight afterward, but what about a coping saw for the centerline cuts?
Just a couple of thoughts for you to consider.