Mike Barone said: "If you have flat kits, this is not necessary for
the one piece bodies, form the basic body of sides and ends only, then
make an inner roof from .030 or .040 styrene that is an exact match
for your car length and width using a machinists square to ensure that
the piece is perfectly square. This is then installed just below the
roof line, at least on stock cars, and will square up the body
perfectly. With this the car lines included in the kit at not necessary."
This sounds like something I want to try-the roof is my least favorite
part of house cars. With this approach do you need to place anything
under the ridge of the roof to keep it from sagging at the center?