I do minimal agitation development with pyro on my sheet film and have a Yankee tank for the 4x5 that works very well. There are apparently no equivalents for 5x7 film so I will build my own from plastic. I've thought of several ideas on how to do this (without the need for gallons of developer and fixer) and have not yet settled on a design that will let me fill and drain liquid in a light-tight system. I know that Jobo print tanks can be adapted to the job, but they need to be rotated and are not suited to stand development unless the tank is completely filled.
I'm asking here for either plans of a practical working system or ideas on how to ensure no light enters the tank yet I can turn it over to pour out developer, stop bath (water), and fixer. I bought some 5x7 negative holders on eBay (now I need to find where I put them), or I can route slots in plastic to hold the film.
Please share your thoughts with me.