BTW, just so I'm not misleading folks that I'm still making these.

I'm not, sorry. I'm working on my home projects for a few months so all fabrication projects have stopped.

I would recommend that you consider these Q-Pex 3/4" brass fittings, they are the next best thing to copper.

Elbows:
You can find these at alot of home improvement centers. They have nicely radiused interior bends, so they will have miminal pressure drop.
http://www.pexsupply.com/categories....D=546&brandid=


Tees:
http://www.pexsupply.com/categories....D=552&brandid=