Dude, that is very impressive work. I too thought that the boom arm was too expensive, but after getting it, like some other festools I have found it to earn its keep. Yours looks great, but I would highly recommend to put a cyclone on it. I just recently put a Dust Deputy ($120.00 or so)on a five gallon bucket with a three way splitter cord and I don't miss emptying bags at all. It's nice having everything all contained.
Per, as discussed in another thread, I have found that having a three way splitter- each of the Festool plugs and a small extension cord is a good set up, but if I did it again I would more if I had them, Eric