Colin.
Bit of a shame with regards to the engine corrosion. It looks from your photos the main engine block assembly is in three parts. Upper holding the cylinders and pistons, middle unit holding the crank and related bits and then a lowermost cast, flat looking rectangular oil sump. Interesting design, if true. Could make for a lot of flexibility for various installations, but also a lot of headaches for restorations. And, of course, the latter point would not have been on anybody’s radar in the Meadows Design Branch in the 1930’s.
David