Where were youlanning to "let him fly" the PT 40. You really need a large plot of land to avoid hitting something or someone. (Like many acres without houses, kids, etc.

The A-10 is a fairly quick plane, has to be flown pretty much full throttle to keep it airborne. I wouldn't suggest it yet. Get a GWS Slow Stick, Cub, or Tiger Moth first. Or better yet, why don't you both join the local club? You can get some refresher time before flying the A10, and your friend can learn without destroying the PT 40.

Welcome to RCU, and welcome back to RC.
Dennis-