Distilled water and a biocide ( PTNuke
) instead of premixed coolant ( you can use a silvercoil
I've never used Indigo Xtreme but I think the reflow process would probably be a pain to try with a liquid cooling loop.
You could use a couple of reducers
for the NB block ( don't know if the included barbs are removeable )
Have you done any research other than to make a parts list ?http://www.tomshardware.com/forum/256607-29-watercooling-read-first