anyone got reccomendations for where to weld in RHS to support the body so it stays in the same shape and that still allows me to hang the door with them there, im thinking one across the Apillars and one across the B pillars then 2 other sections welded to them fron to rear like a II type shape, anyone got any better ideas or reasons why this wouldnt work?

Have a look through Jon's post on Black Betty

http://forums.aussieveedubbers.com/viewtopic.php?tid=24785&page=4 

He had the same thing. Ended up cutting and replacing sills and A pillars etc etc

Jons doors shut better than a Beemer now.
Jon had NO experience before he did this either