I'm a new GM and I've got a PC that is playing an IH Techmarine, and besides being tough as nails to wound, his sole purpose in the game so far is to hack off as many limbs and/or body parts as he can and replace them with bionics; at such a rate that it's comical. It seems that whenever he gets XP or Requisition to spend, he's throwing away flesh and installing some chrome. Fluffy for an Iron Hands marine, I suppose, but it's extremely rapid and I don't like the idea of this marine gleefully sawing off his legs between missions.
In my mind, I would see that this sort of bionic enhancement would take place at the Forge Master's /Apothecarion and take a few weeks; a few weeks that I'm not allowing the characters to spend at the Watch Station (mainly due to the fact we're nearing only the third session and I've yet to flesh out the interior of the station and supporting NPCs). The Kill-team is constantly on a frigate/ship heading towards their next mission; ships that don't have ample facilities to allow for such self-enhancement.
Has anyone faced a bionic fetishist before? I'm looking for suggestions on how often and in what situations I should allow him to be fitted for 'new parts'? Only when he loses a limb from critical damage?
Thanks ahead of time for your advice!