|Dear Koen ,|
I fail to grasp who (what device, anyways) would be the "end user", so to speak, of this network - the routers themselves?
You may get it to work by having a bunch of routers spaced 100 meters (cable length) from each other and having LAN1 interface connect to the router on the left and LAN2 interface connect to the router on the right but nobody actually does it thin way. Pull some fiber optic cable. The prices of both cabling parts and active fiber optic equipment have came down drastically over the years and it may even be cheaper than the same amount of copper cable. Copper's expensive these days, you know...
Dmitri Abaimov, RCDD