The bridge is based on the version of the 65ft extension to a 55ft one, so that will allow me to make both.
I have now sourced some double sided copperclad in a size suitable up 65ft in 7mm scale, though for 70ft turntables I am still looking. The Main parts of the Bridge are Copperclad sheet.
Wheels and centre bearings are Ball Bearing races for ease of rotation.
Track electrical pickup is from the circle rail and centre axle. This requires polarity reversal but does mean that any sound equipped loco will continue uninterrupted.
7mm scale scratchbuilt GWR 65ft Turntable in WR guise.