You might have better luck with this in the draft forum but here's my take. Here is what i recently posted in that forum kind of related to that
raelx wrote:I bought a 6 port anodized aluminum header (distributor) from McMaster Carr for $15. a 6 pack of 1/8" and 1/4" NPT hose barbs was another $6 or so. Pluse $3 for plugs for the ports i'm not using. 5 min with some teflon tape and I have a great non leaking distributor. I can post the part numbers if you want.
You can see it below, click to enlarge

Headers are on this page
on this page Pick what ever number of ports you want. I got a 6 port single sided anodized aluminum.
I put a check valve on the input to the manifold
7768K22And 1/8" and 1/4" hose barbs
5346K14 & 5346K13And plugs, 1/8" and 1/4"
50785K112 & 50785K113In the end I guess it was $30 but i got a 6/7 post distributor with a check valve ($7 of the cost) on the inlet. A bargane compaired to what most beer places want.
I only have a check valve on the inlet to the manifold. I'm not sure why you would want check valves on each line. It will add at least $3.25 per line
(bottom of this page). I have only had one back flow into the manifold when I connected an unpressurized keg up to the system
while force carbonating another keg. So there was a dip tube on the line. Under normal situations you wouldn't have a liquid line on that side. It took me 5 min to flush the requlator out with starsan, no problem.
Also I haven't seen any reason to have shut offs on each line, that's why there are poppets on the corny quick disconnects. Again if you want this it is goint to add $4 to each line. So if you want something like what NB sels it will cost you about what they charge for it. I say no shutoffs, and only one check vale. And you can have a 6 port manifold for $30.