Hi there. Got curious about your project... as I play guitar and prefer playing through tube amplifiers. And, I'm available with short notice. I'm based in San Francisco which might be convenient for you as I see you are also in the US?
My background is Computer Science and EE and have have built a lot of prototypes in my days, mostly digital or microprocessor-based but also some mixed signal systems, Have some basic equipment at my home office for assembly, but not to do any sheet metal nor wood work.
I'm not sure if you are looking at just finishing up the prototype or looking at getting some very small scale manufacturing going.
Let me know a little more details and we can discuss the pricing.
Best regards
/peter