OK, as promised I attached some pictures of my completed bottle washer.
The manifold was made of 3/4'' copper and 1/4'' soft copper tubing. It's adapted to a regular garden hose thread. I can fit 20 bottles and I can always add 4 more if necessary.
I rigged up a holder with some scrap pipes and pink foam insulation for now, but I"ll probably switch to plywood later. The pump will be the 1/3 HP version of the pump mentioned by the OP, I'm waiting for it to be shipped.
This was a fun project to do and I can't wait to join the "I'm never scrubbing another bottle" club.