Posted 24 January 2011 - 12:26 PM
Make sure you use nothing but 3/8" fittings and tubing or 1/2" fittings and tubing. As long as all of your fittings are same O/D, and your tubing is the proper size for your fittings, you're fine.
I would suggest looking at good quality crush fittings to reduce the risk of leaks. Out of curiosity, why are you doing a completely custom build?
That's an excessive amount of $ when you can buy a good kit (pump/res combo and good dual fan rad) for ~300$.