I enquired about buying something small from them once - think it might have been a line driver board - but never got a reply. You might need to give them another nudge until you get a response or you may not see it. Larger orders possibly attract their attention more easily.

Dunno if you are aware that there is a cncdrive forum - you may be able to contact them through that http://www.forum.cncdrive.com/

Those housings look the part. Good to have access to decent machines when doing this sort of work.

Looks as if you actually replaced the Z axis ballscrew / ballnut? Did you enjoy machining the hardened steel? Sparks everywhere?