A great journey with the true reward in unique experiences and friendships formed. Thanks for sharing the adventure. No doubt you will take a pint to drown your sorrows and walk out onto the street, only to fall through cracking pavement and headfirst into a Wyvern buried in a long forgotten vault as a contingency in the 50’s. Certainly do not omit the possibility by avoiding the taking of a pint, well deserved. 

Very nice work on the windscreen, with what looks like a newly formed canopy. A lot of work ! 

Pistons of that era were generally cast from Y alloy. Making a casting pattern from wood not so expensive. Forged pistons did come into use in the early 30’s, Eg Bristol Jupiter ‘F’ for Forged piston. Perhaps racing engines in the 20’s did use forged pistons but I doubt it, as they were a ‘one shot’ consumable, given exotic, corrosive methanol, TEL fuel blends. The piston looks to have ‘meaty’ gudgeon pin yoke, which you could cast. Not sure, as I was not alive in 1928.