In my quest for minimalistic darkroom setup I've been thinking about getting rid of the trays and using Durst Codrum photo drum, the 205 model, capable up to 8x10 paper to develop both b&w paper and 135/120 film wound on Kindermann spools (I have few spools, but no tank for these). Spool diameter is roughly 83mm. Will it fit the drum? What do you think about such kind of solution?