Not my idea for the syringe shutoff, I stole that from someone on here. Pretty slick eh?
For an electric vac shutoff the merc climate control relays can be setup to be naturally open or closed. Gasser EGR solenoids are another way to do it, although those are normally open and would take some playing with to make them normally open(if you can at all)
For the filter-turbo connection anything works (assuming it's properly sized). Radiator hose, pvc pipe, etc. Have you considered the stock 180° paired with some PVC pipe?
Found one of the filter threads, the style in post #11 is my favorite:
Washable Air Filter and Intake Mod , With Larger Breather