Duh. Measure twice, cut once. Or measure twice, buy once. First wrinkle. I was going to have radiator connections in the back but the case, but it won't quite work as neatly as envisioned. Radiator to radiator connection interferes with mounting the 68 mm case top. Yes, I could mod the top, but I sort of hate to drill holes in this case labs stuff...just too nicely thought out. Well, this opens all sorts cans of worms up, like even putting the radiators in parallel rather than serial....I'm going to sleep on it.