Got to say, and not being rude there is some false information on this thread..

Puma shafts do fit Ka hubs, but are the wrong length.
It's much easier to bolt a Ka box with puma bell housing to the puma engine. I would imagine that the subframe would be quite challenging to fit to a Ka. The Ka is based on a mk3/3.5 fiesta.

It's a relatively easy conversion although not done it myself. But I have done the fiesta turbo conversion and after that put the FRS engine in one.