Re: Origo/CookMate gimbals
Sounds correct. FWIW, Origos (Cookmate is a clone) came with or had as an option a SS liner pan set up to take these gimbals. It is roughly 20.5x16x6" and offers both a crumb catcher and a resting surface for the stove in 'down' mode. Our boat came with one & we are incorporating it into the galley design. It seems you need to choose whether you want your stove to drop forward or back & mount the side plates accordingly.
You should be fine with Formica-covered plywood under the stove. I like the idea of a fire-resistant catchbasin there anyhow, just in case a dollop of burning oil escapes containment. Hate to have that end up in the bilges!
Albin Ballad 30, Fionn