Dave you can weld you just haven't learnt yet, it's a great skill to have and easy to do.
I have made 80% of the shelves in my shed some from skip bin formply and others from pine studs and ply shelves, my widest is the length of those plastic tubs with lids you can get for around $12, I find shelves about 400mm wide ideal.
I have used mdf for a 500 mm shelve with no cross bracing and it bowed like a boomerang will redo them with ply one day.
I do have a lot of woodworking gear in the shed, l wouldn't want to build everything i have with a circular saw and drill.
Will post photos if you want any ideas.
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