Experts will find this topic very boring.
Today I started making a tool tidy for my welding table.
My welding bay is all aluminium (floor, bench and fixtures) so it is only natural that I decided to make it out of aluminium 6060.
I purchased some 20 x 20 x 3mm or 3/4 x 3/4 x 1/8" square tubes and some 25 x 25 x 3mm or 1 x 1 x 1/8" square tubes, if you have some off cuts from a job that would work well but my aluminium shop cuts my lengths to exact size and only charges by the weight so I have very few off cuts.
This tool tidy is to organise all the tools used every day like screw drivers, files, ruler, square, pence, scriber, hammer and so on.