If you're willing to share your design, I'm sure there are other folks like myself who think this is a cool idea. I've wanted to do PoE (or passive PoE) for lights for a while now...
I am going to open source it. The goal was to be able to get all the SMD stuff available at JLPCB so you can just send it to be fabbed (with some thru-hole components you would just solder yourself) or I would also sell them at cost + 10%. My brother designed some 802.3at chips and was going to have him review my work first as I don't want to send out into the world a poorly design power system (there are enough of those things out there unfortunately).
