Frame jig for Cutdown project

Got hold of a decent piece of steel to start making a jig for the cutdown project frame. Had to get hold of external workforce to be able to handle the weight, I recon it is better to get the youngsters involved in old iron rather than the telly.

Years ago I came across an Evo chop based on an IOE frame. Luckily back then the Evo chop owner had not thrown the lower frame section in the dust bin, now it came in handy.

Its good to know Harley used pins trough through their cast pieces where they are joined with pipes.

Anyone know what the foundry mark in the lower frame cast means??