Would you consider buying plastic servo trays, to install them in a kit plane? Or build one out of a piece of plywood, and screw the servos to the wood. The kit plans suggest screws directly into two pieces of wood laid accross the fuselage.

Sounds like a 4*?
I made "rails" accross the fuse to fasten the servs to, works great.

When I get a new radio, the second thing I throw away is that plastic servo tray (the first is that neckstrap). I find that every plane is just too individual to ever need all the servos mounted to one of those little plastic trays.