Building A Motorcycle Turntable

[KTMsm]

I'm looking to save time in selling bikes and have noticed several dealers are using a turntable (only need one clear wall)

I'm thinking castors on a frame with alloy sheet over the top, I did ponder about using a stub axle and wheel bearing to centre it

Has anyone got any bright ideas or of re-purposing something similar ?

Has to take a 250kg bike approx 7' diameter

[KTMsm]

It's a conc floor which I could use self levelling or run the castors on a circular track, negating the need of a centre bearing

I'm sure there must be an easier option than starting from scratch

[KTMsm]

I like the ptfe idea - low and easy to make

I've seen a couple of (for want of a better description) "trays on casters" that others have made up - it wasn't what I was thinking of but it might do and be far smaller to store