So I got this cart for 50cents or $1 at a tag sale a couple months ago. You can see it under this band saw. It's 1" thick, 12"x30.5". It had fixed casters because it was used as a tv cart I think.

I swapped out the fixed casters for 2" swivel locking casters from homedepot.

I just need to bolt the bases to the cart and its a perfect mobile dual grinder cart. Buffer on one side and wire wheel and grinding stone on the other.

And yes I will turn the bases to both face the same direction before bottling them down.
I will eventually add a power outlet/switch of some sort to the cart. I gotta find some dust collection bags and a place to put grinder/buffer accessories would be cool too.