Jeff,
I made two of your mills and have been happy with them. Biggest issue is I want to cut metal harder. Sad to hear it takes too much work. I have spent a lot of time looking at your PIC-1/0 V.1 and trying to find a way to make it worth some money to remake the circuit.
I think your motor controllers are very very good compared to the standard design on the market of just strapping bigger motors and drivers. If the PIC-1/0 V.1 were on a board and the output step/direction/engage lines were screw tabs, along with the input encoder screw tabs, and if the rotation-to-distance could be programmed easily, I think the market for your boards would be massive. Particularly on places like Hackaday where people are having problems with CNC and are strapping larger motors on to solve it.
Through other means, I got one of these
It is close to garbage as I cannot control the motors easily. I want the freedom of the mobile handles that the Lobo has, but the power, torque, and frame of this. The same is true for the Shapoko. The setup, control, and use of them is very very hard because they only rely on endstops. Edge finding and moving the tool with EMC2 or grbl is dangerous and risky as the tool can jump.
If there is any market I would love to see, is your chips able to control homemade CNC machines. Your mills are nice, but there are many mills on the market. Your controller is unique.