welcome aboard , sounds like you got some work cut out for you making it in metal , if you find it's to hard you could always try sintra/foamex (USA/UK)
My first suggestion is to lean away from multiple pieces for the chest and maybe use that on your back instead. That has a bad potential for pinching the ever lovin god outta you when you bend forward.
Thanks guys when i was drawing it i messed up on the chest armor there will be less chest peices, basicly there will be the tipical three peice with the medallion
pix to come