started by making a few jigs to hold the tubing in place. one of the jigs replicates the cyl. head for building the headers themselves. i made a second for holding the collector while it is being fitted, epoxied, machined and finally fitted with the collector outlet. i also made a piece to form the collector bends in. i heat the tubing up and place it in the bend and let it cool. that way i get consistent bends to work with.
not a finished piece yet but, i think this is probably my best collector to date.