Plexi is going to be terribly expensive to do and have it solid. More expensive still if you f*ck up a piece. Good luck with that.
To clean baskets I like to whittle away most of it with a utility knife then run an angle grinder around to take it down to bare metal. Utility knife method isn't fast but once you start grinding (burning) away the foam and glue you'll see why I like to have as little of that smoke/fumes near me as possible. It's nasty even with a respirator.
When you re-mount the frames use a little drop of glue on the edge of each bolt so they don't loosen up over time.
Oh, and depending on when you get to this, I have some Zv3 18" cones and spiders back up north I'd sell for below cost.