Well done man, it looks great! ill be watching this thread, dont worry if you have a lapse in updates, sometimes you just gotta do some other stuff.
and as for the ab plate I plan on using a similar method as carnage but use some Chicago screws and nylon strapping so its secure but has some give.
Ill use his method to line it up but I will fiberglass 3 chicago screws on the ab plate and the chest armor then take appropreate lengths of nylon straps and mark up where to make the holes(ill probably put some grommets in the nylon to keep it from tearing). this way I can take off the ab plate and finish with more fiberglassing for stability, bondo, and then paint it without it permanently being stuck to the chest plate.