Still currently in beta, but quite complete and fun to mess around with, and also on sale for a bargain price right now, Disaster Studio's Plane Mechanic Simulator let's you work on the DH Tiger Moth, the Supermarine Spitfire and the DH Mosquito. Here's my video review and overview of it, plus a bit of a tune thrown in for good measure:

https://youtu.be/3WSnN5iDwjg