Purchased all knobs except the mystery super large one. still not sure what to do with that, and have not found a suitable jumbo/giant aluminum to replace. Also still waiting on a couple factors for the final buttons, originally intended to be small square illuminated, ala casino machines almost. however, its not clear to me that i will be able to power them all from the USB through the UMC's, so i have a question out to the company that builds them.
sure hoping that my smorgasboard approach looks okay, but i guess we will see in a few days.
ordered about 100 of these:
and a dozen of these:
from this website: http://www.surplussales.com/index.html
And for the large volume knobs, ordered these from some hong kong seller on ebay: