12 PC625s and 2 ants, I think.
12 PC545 are more than enough
O wait i did it wrong, i meant PC625
Edit button?You could keep the steel flippers and have some wedges on the back for ant-flip purposes, see HazCon if you're unsure of what I mean.
EFIE is still the original. And I would sooooo make a true UHW, but I cannot attach the Betas outside the chassis
UPDATE: Yes, yes you can. 6 Beta's
You can also use something lighter than DSL bars for the extenders