Sorry about the delay, I check at work I forgot to post the images when I got home... maybe i should stop reading from work
Anyhow, no idea on air valves model # or anything, the manifold was only $20, I would think the parts would cost more than this. At $1 per port, it wasn't worth the DIY hastle. As you can see from the header, its connected with 3/4" flexible tubing... it would be trivial to tee off of this into another 20 valve header... talk to the guys at Jehmco, they are big supporters of the AKA... the suggested the size pump we have as well as the header and so far we are very happy.
As for the solder or notch, that might be ideal, problem is I don't have a radial arm saw, table saw or router so I can't run a dado blade. I've still yet to get some black fabric to tank in between the shelves where the lights are, when we do this we'll have that glowing tank out of a sea of black look... Also, the "L" screws the photo taking up a little, but turning off a rack is easy enough.
Jeff