If it's a V12 Delage chassis, it certainly isn't anything to do with Prince Chula as he was only involved with the straight 8 1.5 litre cars.
Is this one of the Emerysons?
I've already admitted I'm having an off-day. I've given clues which are utter rubbish, and this does not help the situation.
So, let's start again. I looked up references online about what might have happened to the 1923/24 Delage V12 cars, but scrolled down too far, and quoted falsehoods about Reg Parnell which you have picked me up on. He was involved with the 1.5-litre straight=8s which you refer to. That's what comes of trying to be too quick and not thinking straight.
It's still locked for you. The base chassis is one of the 1923/24 Delage V12 2-litre GP cars, and nothing to do with the Walker ERA-Delage, not the Chula car, nor indeed the Emeryson.
I really am very sorry. God knows what other members of that "other forum" would think of me if they saw this cr*p. I think I need some sleep - every one of my solved puzzles this weekend has resulted in mistakes from me which have been rectified by others and are due apologies.