If you're at all worried about things not fitting as planned, go to a sign or plastics shop and have them cut a panel from 3/16" plastic of some kind. Should be more than durable enough for test-fittings. Most of them can work with the same DXF file you would take to a metal-cutter.
I used Front Panel Express (http://www.frontpanelexpress.com/). Their software is free and once its done you can send it off to them to get cut on the CNC. It even has a pricing feature as you go long.
As for the visual part, I printed out accurate size pictures of everything (most manufacturers have these published already). and then placed on the panel for the initial fitting.
You could also use a piece of clear acrylic plastic from Home Depot. Cut the holes with a fly cutter or Dremel and add parts to check for a rough fit.
This is good to get the 3D clearance behind the panel. Then you get your own true "glass panel"...
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Gill,
Seeing this makes me think about making my panel from plexi permanently. Of course, it makes it a lot more important to make the wiring and plumbing pretty.