filmklub

Hello everyone. I have been using an mspa silver cloud inflatable spa for a while and I like the heater/pump but the plastic tub is very hard to keep clean. I had the idea to buy a cold water wooden tub and use the mspa heater to heat and pump the water. It would be quite easy to plumb in but I can't seem to match up the threads of the inlet and outlet? I have attached pictures and dimensions. Does anyone know what they are? Thanks in advance.