Hello Tim.
I think the WK will scale down OK . Just playing and experimenting I have built them small enough to run lawn mower motors…
One of my problems the fuel has to be scaled down also. I have tons of wood fist size for the truck gasifiers but had to go to a lot of trouble to cut wood down to 1 inch chunks or less to scale with the small gasifier . ( chips could be easy to get but may not flow as good as very small blocks.)
The smaller the gasifier the smaller the fuel should be . To prepare the charcoal fuel one can take large blocks of wood , make char then easily crush them into small sizes . In making the charcoal you may loose half the energy of the fuel . No big deal because we are not talking about needing much fuel to start with .
In short yes I think the wood gasifier can be scaled down but depending on how small and how you are set up for wood prep it may be best to go with a Gilmore style
Just one other note . The ash /char clean out of the bigger gasifiers are just about the perfect size for the small char gasifiers .