Here's the problem/deal.
If you get a professional in the audio field to build for you, then unless you have some bucks$$ to spend, or he/she wants to work for less than minimum wage there's no way.
It takes much more time than anyone would like to think about to get any amp that is not already worked out and ready to go circuit wise, layout wise and with a physically already built chassis to complete.
DIYers are of two types, those that build a lot and those that don't.
The ones that do build a lot, are busy building or on other projects, the ones that don't, don't.
IF you found a DIYer who had an amp that he wanted to sell, AND that you fancied then you'd have a possible deal.
On the other hand, if say 10-12 DIYers got together on a single design, then it would be plausible that my small biz or one like mine could build them up for you - the principle at work being that since several were being made, the costs per operation are reduced sufficiently so that with that number of orders the project could be seen as a single project, not multiple random orders...
But, with someone like the fellow who wants 75watts class A in triode, it's clear that it would be difficult to arrive at a concensus without some difficulty. You're looking at using some 845 or 211 to do that power in Class A... not a small or inexpensive amp. Even if you are satisfied with a pair of 845s, still a big amp. Parts = expensive. Size = big.
Thus the import Chinese amps start looking good, as do those kits and mod kits (for existing amps).
Consider used gear?
Consider gutting something like a Fisher receiver or similar? Or just modding it? (caps, resistors, jacks, PS, etc...)
As an exercise, it might be useful to post an itemized list of the parts and their expected cost, just to see what you're talking about in terms of a baseline absolute minimum cost before labor or outside services (like machining or anodizing, etc.) No need to list each part, just like this; 1 watt Carbon Film Resistors (20) @ $X.XX = XX.XX$, etc...
Then maybe guesstimate the labor time for the unit you envision.
_-_-bear
