I obtained some high end Acrylic by chance that is tough as nails and made some zero clearance throat plates out of it that are the same thickness as my factory plate.
With my R4512 saw having the real thin throat plates, this stuff works out great.
I’ve already made several in different angles for raised panel door work and such.
It doesn’t sag or bend and the blade cut through it beautifully.
I use some duct tape to hold down the edges.
And, with a 4×8 sheet of it, I’ll make a bunch of spares.
I thought I’d pass it along in case anybody with a R4512 is looking for a material that is the same thickness as their original throat plates.
-- Eric, central Florida / Utor praemia operibus duris