Just got rid of all my 1/2ID 3/4OD fittings. Most the rest are my 3/8 fittings and SLI connectors which I am keeping. Dumping the 1/2 fittings I will never use again made me feel better tho.
(I am keeping enough to convert back to Tygon incase this Copper tubing setup is pure fail)
I can tell ya on that Dom block, I put a pair of 3mm UV Led's in it, then connected them to my heatbeat connector, I think thats gonna look pretty good w/ the fluid I use.