4wd has been done before so it's always possible but for now I'll stick to fwd.

I'm only using the rear hubs of the Focus RS and they are about 3 inch wide which is a bit wider compared to the rear hubs plus drums of the Ka but not sure how much. Guess it's only 1 inch what will make the wheel fit even better in the arch.

Might get some 5mm spacers on the front as well to gain some width