I'm almost finished with the initial rebuild on the QB20 - I'm just waiting on a 2.2uF 630V polyester film capacitor to arrive, then I'll put everything back together for testing.
In total, the parts replaced so far are: the mains cord, five electrolytic capacitors (C43, C45, C47, C49, C51), nine paper/misc capacitors (C7, C22, C26, C33, C44, C46, C48, C50, C52), and four resistors (R11, R25, R26, R27).
The electrolytics in the large can are out-of-circuit, and I've used standoffs to secure the new parts in place.