I think that I am now on the right road with this project.
Instead of two cables: one to each side coming off the sping loaded return telescoping drawbar, I will have only one going down to a two way cable splitter as found on BMX and trick bikes. With the individual cables then running to each wheel and the disc brake assemblies.
I have to shelve trhis project for the next week or so, because of incoming order for more camel saddles, even more Pallet reclamation bars and a quad for a magic show.
Camel saddles:
