Hey Dennis,
I built the GP Spacewalker for my friend, and we used an OS 1.20 4 stroke pumped, has on board glow, and dual elevator servos. No nose weight was needed at all. If I remeber right, swings a 16-6 prop, or something like that. Flys good with the power. He might have it for sale if you are interested. We are in Northern CA.
Red7fifty