I just brought (x1 cinema rocker seat) to start off with, I’ll get another and another and another soon. They are used cinema seats going for £79.50 (paypal) which sounds good for rocker seat, should be here sometime within the next few days.
I’d have to make solid MDF flooring with thick piece of timber placed underneath with each set apart so many inches for support.
I’d countersink the holes on the upper mounting surface to screw the timber tightly and securely and fix the seating into it. I have no idea of if the seats have the original fixing screws but if not it, shouldn’t cost much for screw fittings.
This, what it looks like.