A router table for one-time or limited use can be as simple as a piece of 3/4" (or your metric equivalent) plywood with one edge attached to a workbench with the router mounted under it and a hole to allow the bit to come through with chip clearance around it. The fence can be as simple as a straight stiff board with a notch in the center to clear the router bit, and C-clamps at each end to clamp it to the plywood to hold it in place. If this board is used wide side toward the bit there should be sufficient area to c- clamp a feather board to it to hold the work down against the plywood table as it passes over the bit. A second feather board can be C-clamped to the plywood table to hold the work against the fence board. Once you have a router and some C-clamps you should be able to assemble a working setup like this in less than 2 hours. It will work just as good as an expensive router table, although it will be somewhat more difficult and time consuming to make adjustments and repeat set-ups. I worked with a router table like this for 5 years before building a bigger, better, fancier one.