Agree with Bennie, can't remember us having issues with any of the plastic end tanks on the various 20 year old radiators we've been using.
Yeah I guess you're right, forgot about $200 and one month shipping on the Golpher.
It's going to be a while until we see the end product on the knuckles. Maybe one hour of actual spindle on milling time into it so far. At least a solid day of set up and test cuts before that. At least a day of various CAM before that. Still think it's a better overall solution than making a bunch of pieces and fabricating them. Assuming it works out.