My biggest concern is that the highest barrier to entry (or at least one of the highest) is willing participation. Back when I was a freshman in AEPi, we had manpower problems weekly. At least one of our brothers ironmanned the back hills on multiple occasions, our chair hopped out of the follow car to push hill 3, we had to share flaggers/follow cars with other teams, etc. We were a small fraternity at the time (somewhere in the 20-25 brother range), but even now it looks like AEPi is struggling to find enough people to go out weekly, and they have over 50 brothers. Unfortunately, there isn't really anything the BAA can do about this, other than to make buggy more widely known and loved.
Now onto what the BAA can actually help with...
I like the idea of the "build kits". In reading Connor's thoughts though, I had another similar idea. The BAA could actually build a buggy. This buggy would be relatively modern and stable, though it would be a very basic model (I'm thinking Kamikaze-esque). Then, if a new team is interested in starting, the BAA would loan that buggy out to the new team for the year. In addition, the build of the buggy could be filmed, and the footage could be given to the new team as well. The goal is to give the new team the knowledge to put together a build throughout that first year, then have their own new buggy to start rolling in the 2nd year (when the BAA gets back the buggy it built, and can loan it out to another new org). The mechanics would get a good sense of how a modern buggy actually works, and they could even go about taking apart the components and putting them back together again. This would, in theory, be more useful than an "old" loaner, which is probably very beat up, needs a lot of work, and might not be very useful to a new team going forward.
As I was talking about this to Zatchmo, these two ideas seemed to come together pretty well. Some teams might be interested in the "loaner-for-a-year" idea. But some teams might want to roll their own buggy, where they actually get some say in how it works. So what if we combine the two ideas? Basically, the BAA builds a buggy (based on the build kits) AND puts together build kits. Then, a new org has the option: Either they can get the loaner buggy for a year and build from scratch, or they could get the Build Kit to start off the build but do the build on their own. If they take the buggy, they can jump right in, and they get a video showing how to make a buggy. If they take the kit, they get to build immediately, and also get a video showing how to make a buggy using the kit (because they would also get the video of the BAA loaner being built).
The particulars of how this works would need to be figured out by actual mechanics/builders. I imagine the shell would need to be built in Pittsburgh, but the other components could be built elsewhere and then shipped in. As for the cost of the build, or putting together the kits, that is again something for mechanics to figure out. But the fact that there are mechanics who put together this kit, and a buggy made from the kit, means that any questions that arise can probably be answered by those mechanics (plus, there is a video of the actual build). The option of 1 year loaner vs. build kit also covers those who feel like they want to jump straight in and those who feel like a loaner isn't really theirs and instead want to create something of their own.
Anyway, this is just the outlines of an idea. Those who are more knowledgeable than me can fill in specifics over time. The BAA will obviously need a little bit of manpower to get this stuff done. But I wanted to throw the idea out there for now.