Have you given any thought to PEX tubing?
I haven't personally used it, but from what I've seen it would be the way to go.
Simply run 1 continuous length of tube from point A to point B. It flexes and bends around corners, etc. The only fittings are at the ends of the runs. Usually where you can gain access. Where you actually hook up to faucets, toilets, etc, you need to convert to a copper stub, but there are premade fittings for that.
Just my 2cents. Good luck.