Groundwork

Just been thinking through how I'm going to construct the baseboards. Last time I built a baseboard for a layout it was in the days of 2" x 1" timber frame topped with chipboard. I keep reading about how important well laid track is for smooth running (which does make sense). So I figure that a flat, rigid baseboard that (hopefully) will not twist or warp has to be a basic requirement.

The above diagram is my first thought, nothing new as it's all been done before.

Cross beams constructed from plywood and softwood creating a sandwich. The track bed will be supported by risers and also fixed to the 'Back facia contour board' to create an 'L girder'. The 'Front scenic support board' will be fixed straight onto the cross beams and also to the 'Front facia contour board' again forming an 'L girder'. I am hoping that the combination of the cross beams and 'L girders' front and back with give stiffness. I may cut some circular holes in the 'Scenic support board' and cross beams to reduce a little of the weight. Polystyrene packing will be used on top of the 'Scenic support board' and 'Track support board' to form the base for scenic material.

I would like to have the Backscreen curved around the corners from the back onto the ends. At the moment I have a bit of a blank in how to do this. Using hardboard for the backscreen is a thought and curving this between the plywood 'Backscreen support board' and the 'End board'. Problem is it will be a very tight curve and until I get some hardboard I won't know if that will work. May just use some stiff card pasted onto the 'Backscreen support board' and 'End board' with a plywood former at the top to help create the curve.

If anyone has any suggestions or can see pitfalls please comment.