just to let you know... old-n-feeble... when i was thinking of making a darkroom.. i ended up making my darkroom sink out of wood... i ended up using rust-o-leum to paint it. I used L brackets, and wood glue... then i used caulking (the one with adhesive in it) Anyway, you can look up the various ways to make a wood sink, but it's quite easy, i've never built anything out of wood before, but this came out pretty well... Point being... you can make your sink any size you'd like... and if the wood you use is light enough, you can stand it up agains a wall when you are done. I've decided i'm never going to buy a darkroom sink... but if i ever need a larger sink, i'm going to build it myself.