This year i was more focused on the electronic ignition part of things, but that turned out to be very easy (I thought i need high voltage, 12V worked fine, etc). The hard & tedious part was hooking multiple "shots" together. I've learned a lot about the setup & "show" part of things now, so hopefully it will get easier (& the I won't have to nickle & dime myself so much buying minor supplies) the guy i bought the stuff from is my pyro hero: he has all his good stuff on tape so i can get timing & pair stuff together. He also make's 16" (406mm in canuck ) mortars & his own rockets. I showed up during a BATFE inspection, so they gave me the tour. I have some of the stuff to make some smaller rockets & cakes, so hopefully i can run some trials with that stuff. Money is really the limiting factor. There is an opportunity to turn this into a paid hobby, but then it kinda looses the hobby status.
Advice for any other idiot out there that wants to try this: 1 Brain isn't enough channels. It much easier to have 1 channel : 1 Pyro item as fusing them together makes things complicated. At the very least, use 1 output to double up (15 x 2, using 1 to control). I may go away from the computer control altogether (although it added a lot to the wow factor), but if i were to do it again, 3+ brains & a quick connection system (the screw terminals turned into a major PITA when it was 95* while i was hooking up the e-matches).