I wouldn't be too concerned regarding the zintec steel :~ the coating will burn away as soon as you start welding, you also have to be aware that a gas is given off when zinc is heated- it does need to be watched.
The important thing to preserve the steel is all in the preparation i.e. the keying of the steel- descent rust preparation (zinc rich paint) etch primer etc.
Jenolite rust treatment on the older metals is also good.
If a joggle joint is to be used these are far stronger fully welded along the joins- this will also avoid them opening/cracking etc. -- welds are better covered with seam sealer prior to the top coats going on.
The rear of the 240 is well protected by the bumper supports that are in turn secured to rear chassis legs & boot floor areas- Scaffolding bars spring to mind so if the rear is welded properly a compromise isn't that great.
Good Luck
Regards Bob.
|