Try contacting Weston UK directly at
[email protected]
they should give You pointers where and how to
get Hype 3D in Estados Unidos

Hype 3D vs Giles 3D, IMHO Hype outclasses it.
Giles is smaller and again IMHO more finicky
on setup. Both have their places depending on
your taste of airplanes. BTW, Giles was my second choice.
I still do not have strong feelings on full flying rudder on
Giles. This kind of setup asks for expensive servo
on inexpensive plane.

As for engine, if not choosing Weston's West Eurotech 50T1,
OS 50Sx would be good choice.