With an old airplane, one thing I'd be worried about is Kapton wiring[1]. A lot of these older planes were wired with a type of orange insulator that breaks down very easily over time and under mechanical stresses. A handful of planes went down because of it; Bruce would still need to think about the fire risk and should consider replacing the wiring if he hasn't already.

[1]: https://www.interconnect-wiring.com/blog/disadvantages-kapto...