They seem much more efficient to me. Ironically, the higher heat might help stability a bit as hfe rises with junction temperature and there are some places where the hfe of the transistors seem important. As KG said, surely some transistors were matched and hand-picked, but that process has been lost to the ages.
Also depends on what height you pick, obviously. You aren't bound to the same height the original used and a bit more height will allow you to center items on the panels if that's important to you.
The other factor might be finishing, raw aluminum versus powder coating (not sure how the original GB were finished)?
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