To Balance/ Rocker Plate or Not...?

I was looking at my old Kinetic Rock n Roll languishing in the garage the other day, and got me thinking… has anyone ever tried cannibalising a R&R to make a smart-trainer rocker? By that I mean disassembling the R&R and using the lower base and rubber isolators as a base to…I dunno, mount a cut-to-size/ shape piece of sheet steel (or ply I guess), to mount the trainer on? From what I can see, it’s just the two main bolts that attach the top half to the bottom half via the two isolators.

(I still don’t know where some of you guys are sourcing your plywood. Here in UK, it still seems prohibitively £££ for sheets of the required size).