Gday,I would suggest there isn't a large market for this engine as , in reality,it would only be suitable those WW1 types that had them.There are a lot of round engined biplanes,hatz,skybolt etc,around but who would want to put a rotary up front as opposed to a Rotec or something older in the radial type,The question I would ask is, would say the Airdrome aluminium fuse of their Camel be able to handle the torque stresses of the Rotary.Still it is a work of art and if you are building a Sopwith then go for it but be prepared ,it's on or off. Cheers Ross