msc said:Bench dogs in Uk has a fence system with a flip type adjustable stop along with scale (so one can set more than one stop-extra one bought separately) however Ime suspect on the quality of the 3D printed stops, so am avoiding this system. Maybe they will improve on stops in future but at least they make them over 1000mm from memory -think there are some different sizes that offer.
You can use the fence dogs from Bench dogs on standard 20 x 40 aluminium extrusions so you can make whatever length fence you want, works out very reasonable, that is the route I am going down.