I'm more than happy to build a Modulus-286 for you. In fact, I have it available here:
https://neurochrome.com/products/stereo-modulus-286
I'm also happy to license the circuit to you so you can build the amps commercially. I do get the occasional OEM approach, but so far they've balked at the parts cost.
Building the Modulus-286 on a larger scale would require some tweaks to the mechanical aspects of the circuit. Basically there's too much manual labour in the current build for it to be possible to build the amps economically on more than a onesie-twosie kind of scale. Also, a commercial version would ideally be in a custom chassis for custom branding/design language. The commercial version would also need to be a bit different from the DIY version. Otherwise people will start comparing the commercial product against the DIY offerings. Anyway. Long story short. It's quite an undertaking but it is something I think about periodically. I do have TCA going for exactly that:
www.tomchr.com
That said, I'm not getting a lot of traction with TCA. It's a crowded market and it's hard to break through. Then again, I don't do much beyond posting here and attending trade shows, so I could certainly do more marketing. But
Neurochrome (my DIY brand) has really taken off the past few years and I'm picking up more consulting gigs, so I'm beginning to wonder if I honestly have enough time in my life for TCA. Then again, again, I'm not sure TCA would require that much time once I got it going. At least not at the scale I'm after. I would be quite happy with 10-20 orders/month. That's not that hard to sustain. Getting to that point is a challenge, though.
Maybe I'm overthinking it. It certainly wouldn't be the first time in my life that's happened. I'm sure you're all completely shocked to hear this.
Anyway. This was a very longwinded answer to a pretty simple question. Sometimes it helps me to write these things out.
Tom