[olskool]

If he could get feature size down to 10 microns someone might have a shot at making a microprocessor.

[AstralStorm]

At that scale his hacked together (amazingly cheap) optical lithography equipment will not serve. (See how well it did with 1um lines. That is the main problem.) Nor especially the photoresist process.

Perhaps it can do 5um with a different resist.

[agumonkey]

I'd gladly reproduce some vintage style computer with a large number of his ICs. Just for fun :) a B5000 maybe