Working on the Mirror Cell

So, I've been working on the Primary Mirror Cell Design, and these are some of the candidates:

I think I've settled on the 18-point flotation design commonly used for a mirror this size, but I have had concerns about stability and mirror retention. After speaking with Dennis at Dobstuff, he assures me I don't need retention clamps or a sling, so I'm thinking about a basic bar-triangle design.

Here's what PLOP says:

I have plenty of metal, so either way, fabrication begins tomorrow!