Small Bear have a kit here. Looks pretty reasonable, might be a good place to start.
I wanted to get something closer to the EL-Rad style. Seems like everyone is winding on the Epcos cores these days, though I've got nothing against them. The Small Bear sets are good value - compare the cost to Banzai in Germany.
I reckon a 1408 core could wind to wah specs and be potted up quite nicely.