Cyberware can /could only
replace what You've already got. So If You're a Nartaki or a surgeling with 4 Arms (or Legs) You could replace them with Cyberams (or Legs)
but you could'nt add 2 more Arms or Legs (at least not in SR4A)
But maybe they change that in the Future SR5 Chromebook/Biotec Book ?
Me, I hope they don't change it.
Replacing existing Limbs is Ok.But (ImO) adding new Limbs appears to me a bit too Freaky for SR5
Unless you're ambidextrous....
by SR4A RAW if You're ambidextrous and have 4 Arms you still have to buy ambidexrosity twice more (for each arm)
I think this Rule is stupid but its RAW in 4A
How is it now with SR5 ?
with a four legged Dance
Medicineman