i think it looks good but if you want to throw all the 3500w at it and still reflux i would do 9 * 3/4" tubes. It is easy as. Its how i made mine but havent used yet. those 2 more tubes will be better i think. for saving water they will anyway.
see here
viewtopic.php?f=36&t=8973&start=120#p164417.
if you want 9 i have a cad template i can send over
you can fir 5 * 1/2" tubes in the pc but its tight, 7 is doable too but even tighter, just ask rummy lol.
i just made my PC 420mm long with 16mm tubes * 4 because i couldnt wait untill i went to the scrappy (which was today :angry-banghead: ) but it will still work on over 5.5kw.
if your happy with 4 go 4 :handgestures-thumbupleft: