If you decide to make it a tau themed board, I might have some bits you could use.
My dad works as a Respiratory Therapist and is always bringing me these random plastic bits he gets from these kits they use to perform maintenance on some of the equipment they operate. Often, allot of the parts in a kit will go unused and are simply thrown away, so my dad just saves them. I've got entire bag-fulls of the stuff now. Most of the bits have a kind of Tau/industrial feel to them, and are great for adding some interest to buildings.
If you ever go to Hobbytown in Bentonville, you can see some of those bits in use on that modular Tau/desert table that Mike built (right now its underneath one of the gaming tables in the middle of the store). Most to the buildings on that table make liberal use of the bits I loaned Mike, and a few of the buildings are made entirely of those bits. I don't have any pictures of the table, but if I find any I'll post them.
Anyway, let me know if you're interested. I go to Hobbytown and Fayetteville semi-regularly, so if you want some if the bits I'd be happy to drop some off for you somewhere.