I was trying to figure out how to get my darkroom put together such that setup and teardown would only take a few minutes, since my darkrooms of the past were enough hassle I didn't make as much use of them as I would have wished. In flipping through a Jobo catalog I found a widget that they called a "slot processor" that they were distributing here in the US for a British firm called Nova . It looked interesting, and the comments I'd read in the newsgroups seemed to suggest it could be simply left full of chemi for days or weeks at a time (standard B&W chem, pyro, color, etc. are too sensitive to oxidation to get away with this). Perfect! Imagine a drawer full of hanging files, where each file folder is watertight. High volume, but low surface area, hence slower oxidation, longer tray life. Temperature control is something else they offer but not something I'm in real need of since I primarily do room-temp b&w. I saw one of the units at a local photo store, and broke when I saw the price tag (one more zero than I was expecting). I realized I couldn't match what they make, but I could make a less featureful version that would fit my needs. Please make sure to read the construction notes before you drop cash on the materials, and then read them again start to finish before you begin assembly, to make sure you can visualize what you are doing, lest you end up making modern art by mistake. All of the notes here are for construction of a 4 slot box with a compartment volume of approx 4 liters, sized to allow 11x14 prints w/ 1" available area around the edges to permit agitation. I picked up my materials from TAP Plastics for about $100, the cheaper vendors I was aware of in my area either had too large a minimum buy, or didn't have the pebble-surface material in stock. (pity, as they could have saved me about $50).