Below is a Bailey Bridge Kit consisting of three sections, or 30 full scale feet, integrated into a mini-diorama (which is still a bit of a work in progress).
Four versions of this kit are listed on eBay in an auction format.
I am doing this as an auction to assess interest and to help come to a price point for future sales. As usual 50% of proceeds go to benefit the MS Society.
Build instructions are here on Instructables. The model files are in the public domain here on Thingiverse under a Creative Commons - Attribution - Non-Commercial license. Background on this project is here on this blog.