Thanks for all the great advice. The stacking and staggering on trays is a great idea. One could almost fit two trays in the footprint of one, a huge space saver. Maybe I could place the developer and stop trays as usual because they are more time sensitive and then stack the others. The only remaining question I have is about enlarger lenses. Ive always seen "50mm is good for 35mm". So what would I need for 6X7 ? And would this mean that I would need a different lens for different formats and print sizes ?
You could also buy slot processors. Or build yourself. It's not very hard to do and very space efficient.