It's not a direct welding question, but as it will be my first welding project - that will come with lots of questions during the process - I migh just as well ask the question here: I'm planing to build a storage rack under the ceiling in my workshop. The workshop itself is very small and tight. The rack should accomodate standard size boxes with 200x300mm. Weight per box will be approx. 20kg (45lbs), the rack will have a length of 2.3m (7.5ft) and depth of 30cm (12inch / depth of one box). See the picture below (the angle bracket will be pointed upwards so I don't bang my head on it; ). My question: what type of steel (size, profile) do I need for a load of ~300kg/660lbs, and how many angle brackets are neccessary? One very two boxes? I generally like being on the safe side; call me a "prepper" when it comes to building my workshop. but as space is very limited I like using the smallest possible profile. And it also savfes me some cash (don't have a cheap supplier for such stuff near where I live).