I'm incredibly curious about those engines. Are they custom or is there an actual market for RC faired electronic propeller motors?
Btw, Boeing looked into the flying wing in the 90's/early 2000's as a successor for the 747/777, but killed the project after concluding that passengers in the middle row will freak out because of being in the middle row. I also don't think that other manufacturers will jump on this concept. Aerospace is a very conservative industry, and after the A380 debacle you'll have to be crazy to invest billions in a high-risk project.