Yeah they are just blue project boxes, I bought them from Maplins in the UK but they are made in Canada by Hammond manufacturing so you should be able to get them state side. (this is there contact link if anyone wants it.
http://www.hammondmfg.com/contact.htm They are available in a range of sizes and either clear, blue or IR red.

I used a Dremel to cut out the holes for the 15 pin D subs and used some M3 nuts and bolts to secure them.
I wanted the wires to go under the PCB so I made some stainless and nylon standoff to mount them which were glued to the base with Araldite.

As for wiring, the LED Wiz has 32 outputs. I'm using the top row of eight pins of each D sub for the connections to the anodes of the LEDs. There are four dubs in each box so that equals 32 pins. All of my cathodes are going to be daisy chained in groups of eight and returned to the LED Wiz.
After seeing some posts there was some concerns about sending the whole cathode current through one pin so Ive bridged four of the pins on the bottom row of the d subs together to give a greater conductive area, hopefully this should be ample. Each 4 into 1 bridge is then connected into one wire which is then connected to the ground of the LED Wiz.

I'm using fairly thick wire (0.75mm^2, about 19AWG i think) so this should be plenty thick enough too.
Yes you are correct, there is a female d-sub which connects to each male d sub which is then wired to another male d sub which is then routed to each part of the CPs (I'm building a three sided cocktail). Each part of the CP then has a female d sub that plugs into the male d sub routed from the LED Wiz's. This setup means I will be able to easily swap out CPs when I want and remove the LED Wiz's if I need to do any maintenance etc. It probably seems like over kill and in a way its also of work to save a little work later on but hey, I enjoy it

I think all in all I have about 60 15 pin d subs to wire and over 1000 solder buckets

I hope that explains it, its probably clear as mud. If you have any questions ill do my best to help.
Oh yeah I have made a similar enclosure for my IPAC 4 but I need to redo the wiring as I'm not quite happy with it:

