Wow, that garf site is great!! I've got a couple of good size plecos that will be needing a larger home than the 50g they are now in, and building one seems doable. Have to finish taping and painting the drywall in the basement family room first, and side the garage before it gets too cold. Has anyone else built their own tank before? It doesn't seem too difficult compaired to finishing a basement.
Recently made a stand for my 30 gal tank, used 2x4 for the legs with a 2x2 frame work top and 3/4 way down. The top I then finished with 3/4" boarding planks and also used these to make a shelf. Everything held together with brackets and also 10mm screws.
If you make it properly there shouldn't be any shearing stress on any of the screws in fact the 2x2 rest on top of the 2x4.