you have alot more to work with then we did..
too much irony in your last post!
i have to

first its ironic that
i'm patching up those same butched up speaker holes on the package tray right now that you mentioned...
we did the dutchman and both quarters all at once.
the worst fit was the quarter radius with outer wheelhouse
the lip was waay off.
had to add 3/4 of a inch of material all the way around
on the wheelhouse to make it right.

you have to make the amd fit
add some metal here,take off some there.

the even more ironic thing is the looks are decieving comment
i'm waiting for the weather to break to drill out the main floor on the blue 71..
it looked real solid until the blaster started turning it to swiss cheese.
i almost expect it anymore..