It’s a multi-layer board so it’d be hard to do a circuit diagram without destroying it. Just as importantly, it’s got a lot of custom chips. Thirdly, the units found were prototypes and didn’t function 100% correctly. (super drive only worked as 800k, SCSI interface was slower than production card)

Even if you got past those problems, you probably couldn’t sell it at a price that many people would pay.

The idea behind it was to have a less expensive unit for educational purposes. The upgrades would have been interesting in a new machine but a lot of us have a IIgs with better hard drive interfaces, working super drives and so forth. Not much incentive to spend $1-2k or more on a Mark Twain replica.

Would be interesting to see one of the protype IIgs clones and what changes they made