I don’t really have too many answers for you, just some info:
As far as blasting goes, the sand blasting cabinet we have is probably too small to fit a full frame in. I know there’s a small blaster (think sand pail) that could potentially do it outside. I’m not sure how functional it currently is, but cleanup would be something to keep in mind if used.
There’s some talk about building a powder coating cabinet (see here: Powder Coating at the Space - #12 by dallasmagna), but currently we don’t have that ability. There’s definitely interest by multiple people, so it’s worth watching and potentially collaborating with them.