I'm the kind of guy who rarely sees a piece of gear I don't covet, and I'd love to have that kind of dedicated space and gear to explore our favorite little microbes and learn how they work and live.
I would be the last guy to discourage any homebrewer from engaging in some over-the-top fun with equipment and process, but unless by "yeast prep and propagation" you mean something more involved than I think, you don't need a laminar flow hood. There are guys out there doing yeast ranching with little more than a good pressure cooker and a few plates and test tubes. Like most aspects of this hobby, it takes a lot more knowledge than it does stuff, and most of the knowledge is free for the taking around here.
That said, if you plunk down for the hood, please do post some pics and let us know what you're up to. I'll raise a glass to your efforts and be glad to share vicariously in the fun.