Well, we just got the Rascal Racer in optimization. The Goshark project is still on hold. We've tested different wings: FT folded in scale, KFm2 and FT folded with a wingspan of 70mm. The most stable wing is the FT folded wing with 70mm wingspan, but this is not scale! In addition, we have only tested the 50 mm EDF units from Hobbyking so far. The 50mm EDF unit from FMS is currently not available. As soon as we have this EDF unit, this project continues - i promise! After all, i have the decals ready! I could put together a BETA plan for you with the latest parts, if you don't want to wait.
What a cool plane. I hope the plans get published.
I've been reading up on EDF design because I'm scratch building one also. One thing you might consider is intake size. It looks adequate, but you can test a "cheater" hole on the belly in front of the edf to see if it is starving for air on the intake side.
My ideal for FT would be a new edf design like yours that is simpler to scratch build than the Viggen. I downloaded the plans and beside the fact that the cut lines didn't line up it was so complicated I decided it would be easier to design from scratch. Also Banggood has a 64mm 3s unit for $15! If it works half decent that would make a perfect cheap starter edf.
Keep us updated, I love your design - simple yet elegant.