I built the Sig 4 Star 60 and I love it. I'm using an OS 70 Surpass in it and it flies great!!! If you go with the 60 size, the Sato 82 would be fine. I put a .56 Gold Knight in my GP Cub and I love the engine.

The 4*60 is easy to see in the sky if you come up with a good covering scheme.

Building the plane is a lot of fun. The plans were easy to follow with a lot of photos in the plans. I can't think of any real difficulties.

I don't know anything about your choice in raidos since I'm a JR guy.

Here are some photos of my 4*. Let me know if I can help.