You could probably buy a fiberglass or stainless steel sink on an online auction and spend roughly the same amount of dough. I also built the basic table, which I like very much. Probably the most useful aspect is that you can tailor the designs for your darkroom. A film processing tank. I have two stainless steel tanks, one holds one 35mm reel, the other holds two reels.
Some people prefer plastic reels.
If you get a tank which holds two reels, you aren't required to develop two at a time, you can develop just one. A pair of scissors, to cut the film. Containers to hold the mixed chemicals - one for developer, one for acid stop, one for Fixer An accurate thermometer, to determine the temperature of your chemicals and the correct developing times. Film clips or wooden spring-type clothes pegs, to hang your film to dry. A can opener to open your film canister.