This build has a real standard that will accommodate a 14' plate and will sport a Zeiss Apo Jena Tessar f9 60cm that requires one meter extension for portrait work.
Hoping to get over a meter of extension with something that is convenient, portable and practical to load into a small car.
Tips on the track-extension-folding system are invited.

three minute time lapse video that shows assembly and focus test.
https://www.youtube.com/watch?v=p9XQrT_zBF0