Here's my Thor build:
I used some "amp caps" and some CC's.
Of course i couldn't A/B with other parts, but all i know is that my Thor sounds fantastic
and it never left my rig since the day i built it!
I mostly used metal film resistors, especially in the input stages. The CC's went to the "speaker emulation" filter.
I doubt if they improved the sound, but maybe they added a little something (...noise).
The large "amp caps" are probably an overkill, too. At least in such dirt boxes, according to some.
I always use such caps. I found many times that they sound "better" to my ears.
It's DIY after all... Do whatever pleases your soul!...