An update....
After fiddling around with trying to get enough identical used slats to cover 30 spaces, I bought five 8' lengths of cedar 1 x 2s from Lowe's at about $8 each, cut them to length (one 8' section I cut 1/4" too long, but I was able to recut ok), sanded them and finished with Danish Oil neutral, and the results are shown in the pix below. I was really happy because normally I can do anything I want with metal, but wood just splits when I touch it...
Also the front lower frame brace was rusting through, so I cut a piece of 1" square steel from Tractor Supply, need to paint it in the Spring.
Added a new set of casters from Amazon,
https://www.amazon.com/dp/B0BG5BHKSD/?tag=tvwb-20, which turned out to be a 1/4" larger in diameter than original, and required using the frame inserts which came with them. I figured I'd keep them and not return them, a little larger wheels won't hurt on this size grill.
It's now pretty much the way I want it as a daily (weekly?) driver, it came with decent internals for the most part, I don't thin the PO used it very much. After painting, then to install the great decals for the gas weight assembly I got from Jon Tofte....