Shoot I suck! Well better late than never right?!
Ok so with your burners here is how I'd think about setting it up.
Tank -> 0-30PSI adjustable regulator w/ hose -> Male Flare x 1/2" NPT adapter -> 1/2" Gas Shutoff Valve -> Entrance into 1/2" ID manifold -> Some length of 1/2" black pipe -> 1/2" black pipe reducing tee (reduces to 1/4" FNPT) -> 1/4" hex nipple -> Dual stage low pressure regulator -> Some length of 1/2" black pipe -> 1/2" black pipe tee -> Some length of 1/2" black pipe -> 1/2" black pipe tee or black pipe elbow
At all point the tee is mentioned, that is where you branch off for your burner. The reducing tee (don't worry I'll give you some part numbers) will adapt for the low pressure regulator I'm going to recommend which is 1/4" NPT inlet with a 1/2" NPT outlet. The some length of black pipe sections is in between your burners - the tees would come out somewhere in line the burners. In between the tank and shutoff valve and first burner you'll also have some plumbing for your specific setup. I don't know if you're planning to do a single tier or gravity fed setup or what so you've going to have to adapt these to fit your situation but the principle of what I've suggested stays the same.
Now - based on the burners you have, at the first tee branch before the dual stage low pressure regulator, you'll want a shutoff valve right out of the tee - a 1/2" gas ball valve would be fine. Then you'll need a 1/2" NPT to Male Flare Adapter, a gas connector hose, into the orifice of the burner and one of your 6" burners. Again, I'm recommending the 6" because if you use the 10" on high pressure you are going to go through propane like it went out of style.
The next two tee branches actually are going to be pretty much the same as I described above for the high pressure burner. I'd put the other 6" burner in the middle and the 10" on the far end. The 10" you'll probably use for HLT and the 6" for mash because it heats more gently which is ideal for mash.
So onto some parts that you'll probably need to order:
Regulator, Hose and ACME connector for tank:
http://www.tejassmokers.com/gasregulators.htm - COMRI-30 and the REDACME Inlet fitting (this is important don't get green).
Gas shutoff valves:
Dual stage low pressure regulator (this is just a link to an ebay search - you should be able to get one around 40-45 shipped):
Orifices - you're going to need 2 of the CVO125, and 1 of the CVO250. One CVO125 leave with the standard #61, one ask to be drilled to #42, and ask them to drill the CVO250 to whatever they would drill it for their LPCAST10. Talk to Cheyenne here - he is really knowledgeable.
Gas connectors - you'll need to do a little searching here, but I would recommend the Marshall Excelsior hoses. Here's one place to get them:
The MER413-XX are 1/4" ID hoses - I'd get 1/4" ID for your two low pressure burners. The MER613-XX are high pressure and 3/8" ID - use this for the high pressure burner.
All the other parts I think you can source locally - or just order from McMaster (like black pipe, fittings, etc).
This should get you started. The one thing you need to know about this setup is you're always going to be fiddling turning on and off the mash and hlt burners trying to maintain temperatures. Gas controls like the VR8200-A would eliminate this issue but with a little more complexity because you need the valves, pilots, and then some way to control the valves (ie PID controllers or something like Brewtroller). Let me know what questions you have.