I've just taken some time out to make a mock-up of the bridge which will be at the back of the display over a valley with a stream (and maybe a path or road) under it.
The first photo is a side view with a rule to give a guide to size - just over a metre in length. The wider Steck supports will be the end ones so one end of each will be against or maybe slightly under the baseboard carrying the track.

Here's an angled shot which gives a better view of the structure. The bridge parts will be screwed to thin MDF to keep them more rigid and safer from being knocked off.

A close-up of one of the end supports. All the supports will be finished off entirely in Steck walls where they are visible to the public and the sides will be topped with battlements. (Must put them on my DS order!)

Finally, a detail close-up of an end support showing a buttress style corner piece; these will be used on all the corners of the small, central pier and on the outward facing corners of the end supports. (Something else to order!)
