I'm also envious of your abilities, it sounds like they are hard-earned on your part, requiring a great deal of diligence. That is very commendable, if I wasn't so dense, I would be doing similar things.
I took on a speaker project, in which I had the enclosures built to my specifications, and built crossovers designed for me by Dr. Arthur Loesch. Tannoy HPD drivers are what I used, for which there is a great deal of available information. Luckily for me, they are a smashing success.
I would like to build tube electronics, but my own limitations are holding me back, which is why I so greatly admire your work. Well done!
Regards,
Dan