As it turns out, it's a lot harder to fabricate things when you aren't a student that has a 24 hour machine shop at your disposal (or a free machine shop anywhere, period). Bemoaning my separation from the CSAIL shop/stockroom and the ever-helpful staff of the Pappalardo machine shop, I began my lengthy search for outside resources.
First up were the two endcaps, which absolutely needed some portion, if not all, of them to be CNC machined. I shopped around at a number of fabrication services (as an aside, why does every place require you to submit a model and then wait around for a quote? It's incredibly awkward to ask for a quote from someone for a tiny one-off personal project, knowing their answer will be way outside your budget and use case). Disclaimer: I am not affiliated with any of the companies I'm going to mention, I'm just a broke recent-grad who designed a thing way beyond her means to produce at a reasonable price.