That Escort Cos shell looks very nice, the problem with building a Escort is simply the cost of the parts needed to build it into a good all rounder, saying that I can't see a Evo being that cheap to sort but then its a better setup out of the box.
The Focus is sold but I presume you know someone who has it for sale now ? either way same issue as the Escort, pricey parts to finish it off if not worse in comparison to the Escort as its nearly bare.
Out of the 3 it would be the Escort for me as it needs tidying and some nice bits bolting to it, the other 2 need a LOT of work to get to even that spec.
BTW its James who had the Hewland box from you