Everythings looking pretty good so far. Top ring gap measured .58mm and bottom .53mm. The piston still has a fair amount of coating on it and not a whole lot of blow by. Could probably put it back together and let it go another round. I may look at simply sourcing some rings yet - but I also have a spare piston on the ready.
Stock base gasket was a single 0.5mm. I'm yet to do any real checks to see where the piston aligns in relation to the ports. I'll do that later on, but overall can't really fault the curve of the stock engine.