Some interesting cutaway photos from a flatty Ford V thing:
HAMB circa December '08

Does the inline 'ply-do' head have the same contours with a 'quench' side situated very close to the piston (at TDC) opposite a hump on the combustion chamber-valve side?


I'd be worried that thinning the quench side would weaken the shoulder where it transitions up into the combustion chamber.

Seems a fully custom piston running proud of the block on the quench side and popping up into the combustion chamber might be a better strategy - with as little machining on the head as necessary.