You can basically develope large prints in small trays/troughs if you presoak the print in water which insures a more even developement.
It is important to insure quick and even wetting of the print in the beginning otherwise you will get stripes. The problem with fastening paper onto something is that it will expand when soaking up water. about 3-4% in one direction. This will cause creasing on the paper if fastened too tightly on something when it is dry.