I think the best parts of both the WB 60 and 40 is the sheeted foam. It is very accurate and first class construction. The WB 60 wings look perfect when glued together in regards to washout, incidences, etc.

The WB 40 has a lot of ply construction, but it looks to be very strong once together. I'm not going to worry about it.

I would guess that the Saito .91 would turn the WB 60 into a real performer for pattern too. I'm putting a Saito .72 in my WB 40.