Unless you have solid motor mounts make sure that Relay box has enough clearance for when the engine torques over. The blower is going to move that way too, it isn't static.
On that note make sure there is clearance between the Stillen intake and the strut bar for when it torques as well.
A smoke test isn't a bad idea. Otherwise carb cleaner sprayed on the joints while it's idling can help track down leaks.
Catch can is a really good idea. Not sure if you added it or not but don't see on the list so mentioning it. You should see the crap that comes out of one once boosted.
Some sewing machine oil can lubricate that BOV if needed.
Take video
