Yep, we thought that would be a cleaner look than a fill cap glued to the plastic tank. We thought about putting the filler on the block also, but then we would have to make a custom block just for these tanks also.
4 side port return, black anodized pumps with hidden hardware and 3000 psi gauges... add in 4 Kinetiks, just for fun... and you have one sweet setup!-I will have this one finished up by the end of the week.