Yeah it's a shame but, what ya gonna do, at least I tried and know now.
I think with a double sided board it would definitely be possible but it would be much more preferable to have an experienced tube layout-er tackle such a job rather than keep making prototypes.
It did help me see that for something where the distortion sound is the main attraction it was probably too loud for late night playing as opposed to the self split type amps which are usually just right.
I've still not had any inductor issues, I tried a couple of different ones and it made no difference whatsoever but you are also playing in much smaller enclosures with more gain than I am.
IMHO, a 3 gain stages is too much if you try to push the power section, I prefer just one or two gain stages and some kind of transistor overdrive before.
It sounds like you might prefer the new board I mentioned in my post above, if it works out i'll post up the layout for that too.