look for an old ansco 5x7 studio camera
they are built like a tank and can be bought
for not too much $$ ( on eboink ) .
they are usually built like a tank.
if you plan on using old large portrait lenses
you might consider as others have suggested
the next format up. the lensboards are BIGGER
so they can handle the 14" lenses more easily.
have fun with your project/s !
how did the singer sewing machine factory
project you did a while back go ?
5x7 is a great format, have fun !