If you are actually planning to fire up this engine then I would be worried about your previous comments re cutting cooling fins with a very fine passage between them (your post of Mar 23 2017 refers to this - to remind you over two years later !). With a small passageway between the fins airflow will be restricted and hence heat dissipation. Heat dissipation is important because the piston and cylinder bores must heat at a similar rate. Otherwise if the piston heats a lot faster than the bore it will jam on the inside of the bore. If the bore heats a lot faster than the piston then the sealing around the sleeve valve as the piston moves up and down will be lost !!