Howdy Nick, looks like you have a cool find. I can't tell from the one photo but it appears that it is fairly recent-the sheets of parts look to be laser cut. Wish I knew more.
BTW-welcome to Freerails. Do you have a gallery for your photos here?
Woodie, thanks for the comment. I have posted the other 4 pics to my default gallery. This is a recent kit (less than 7 years old). I am sure I will find all of the instructions somewhere in my crazy mess of a garage, I was just hoping someone was familiar with the kit.