Thanks offgrid.  Yes, I meant the 1/2' supply lines.  Ended up getting 2) barbed brass fittings with 1/2" threaded male opening on the other end.  Cut off the plastic pex fittings, ruined the rubber bushings when I screwed in the brass coupler, didn't have a replacement bushing even at the hardware store. After cutting off the pex fitting I installed the barbed piece with a hose clamp for both hot and cold, hooked up to sink, took maybe 5 minutes.  Waited about 2 hours with pump on to check for leaks, there were none. 

Sounds like a very ambitious job to change the plumbing in your house, I can't imagine cutting so much drywall/plaster/paneling on the outer walls to accomplish the task!  I installed the copper lines in my house when it was built in 1979, no leaks to date and I really like the heat transfer on the hot side.  All cold side pipes were insulated with the blue styrofoam wrap to eliminate condensation in the basement area.

I had to raise the house 9 ft higher due to chronic hurricane flooding here in the OBX. It is a 1930's house so all the old copper supply plumbing was shot. I installed a hot and cold water manifold (like a breaker panel for water) and ran separate pex hot and cold lines to each appliance/fixture. No tees or elbows. Its a single story house so once it was up in the air all the lines ran under the house through the floor joists prior to installing the new subfloor insulation and plywood underpinning.  Very inexpensive, easy, and no leaks. 

Pex is great stuff, reduced freezing risk vs. copper because its flexible.  It should last much longer than copper as long as it's not exposed to UV. I don't like the exposed hanging low point drains in the rPod for that reason. I covered mine with pipe insulation.