A copper head gasket would be a doddle to make, I would say after you make a dxf you could have 15-20 laser/water cut for $100AUD.I got onto a supply of hollow bar in casting grade aluminium, so Nikasil sleeves will be a snack for me to do here.No more rebores, use the cheap as standard size pistons, no need to look endlessly for newish cylinders.