I have a Beseler motorized roller base which I use with a print drum for my larger prints. Now I am thinking that with a small bit of fabrication work I could use it to roll a 35mm/120 size stainless steel tank during the stop and fix processing stages. If I used this approach would my stop and fix times remain the same? I assume that I would want to slightly under fill the tank to get proper agitation. How much of an air space should I leave? Note that I plan, at least for now, to continue doing my development stage with manual inversions to maintain consistancy in my processing.