The Z'traska are an order of Githzerai monks and zerth who operate out of their monastery in Limbo. What sets them apart from other Githzerai monks is their doctrines. Namely, they beleive that since Zerthimon discovered that steel was better than flesh, that they should replace their flesh with steel. As a result, they have mastered shaping karach in a fashion no other group has: to form muscles of metal, and armored skin. Often, it is used in conjunction with other metals which provide a rigid framework for the implants. The current sensei and leader of the order is a monk known as C'reshquetal, who has replaced his entire body (except for his brain) with the cybernetic grafts.
Game mechanically, this can be handled in one of two ways: either the monks take cybernetic components from d20 Future and d20 Cyberspace, or the half golem template (ignoring the alignment shift caused by the latter). In the former case, their fighting style is designed to utilize the spurs that virtually all of them have installed.
That's interesting.
I'd make it a prestige class, I think, based on the half-golem template spread across several levels.