Great!! 
will they fit on ur vest? I mean, I made my armor out of cheapo plexi-glas, but to make an excellent fit, youd need to be able to fold an A4 paper around a football... if ya know what i mean, there for its impossible to make the backplate out of oen piece of plexi-glas, so myn is a 2 piece alluminium construction.
same goes for teh collar plate, I had to bend myn a little in teh center to get more of a /\ -form
great idea, think i'll try that out soem day! 
could you show more pics when theyre attached to teh vest?