The Diggle Valley RailRoad Roundhouse

Hi Rob, the main concerns I had for the mechanism were simplicity and reliability. The weather is rough here at 1000 ft and it is going to be out all year so it needs to be durable. And I am useless and uninterested in complex electronics and wiring.
First idea was a lazy susan mecnism my wife spotted in a Chinese restaurant supplier in Manchester. Aluminium ball bearing race, about 12" diameter, but designed to take a 1" thick 4 ft diameter glass table top, bargain at £13.00.. I was working on this when I recalled we had a lot bigger ballbearing race on our table top barbeque. I was allowed to use the whole barbeque, jigsawed a whole and dropped it in. Still got the burners and valve underneath. The hardwood cover was ideal for taking the turntable deck. At the end  of the track on the turntable deck I have the adjustable piece of LGB track to marry up to each track in the sheds. I am on the Dark Side so all tracks in the shed are live as is the track on the turntable, all I need to do now is to wire up a DPDT switch to prevent shorting when turning 360 degrees. Turntable is hand powered and will take up to 48" locos.
It is possible to motorise this,but it will take some power to do so. Hope this is of interest.
Dont ask me about the smoke system in the sheds.......