Going to continue the theme here and say that is an awesome stand!
The size and height of your chambers will depend somewhat on your equipment - size of skimmer determines size of skimmer area (and the skimmer's height may determine the depth, though that can also be adjusted by putting the skimmer on a stand), size of return pump for the return section, etc. Usually if you're doing bubble traps you want about an inch between them, can also do 3/4" between the bubble trap baffles.
Make sure to ask them to grind the long edges of the baffles, so that they aren't sharp... cuts + SW = sadness.