And a minimum of say 8mm - 10mm thickness steels.

And side outriggers that can swing out and have screw down feet to provide greater width/stability.

Might give it a go myself one of these days 

I built a ride on table, which works really well, with Tyre clamp on each end that bolt down onto the table, but the ramp angle is a bit steep, going to make the ramp longer to shallow up the ramp angle a bit as I can't stop the bike on the ramp as it just slides down with the brakes on, bit scary at times.