Makerpipe ( https://makerpipe.com/ ) is this fun Kickstarter that makes connectors that allow you to use inexpensive EMT (Electrical Conduit) for creating things. It's kinda like having an Erector Set for adults.
I hope they plan to roll-out more connectors. I made these ½ to ¾ inch EMT and ¾ to 1 inch EMT telescoping adapters for more portable EMT projects.
You can find the bolts and wing nuts at most hardware stores.
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I've been using Makerpipe on my Solar eBike Trailer Project ( https://youtu.be/F27a7yQKD6s )
The author marked this model as their own original creation.