Wouldn't a power2 number of chips make things a lot easier ?
If so, would it be doable to increase the 10 chips board into 16, and the 20 chips into a 32 chips board ?
And maybe an eight chip board for the people with a limited number of chips.

There must be a reason why Avalon created 8 chip boards and Klondike is going for 16 and 64.