I’ve included some pictures of the small jib cranes I’ve built. The smaller one can lift 500-600 lbs. fully extended. The larger one can lift about 1,500 lbs. The larger one started out as an engine hoist, but little remains that hasn’t been modified or strengthened. One thing that I do recommend is that I used a hoist with a load brake and a large wheel which I made. This allows you to lift or lower a load without fiddling with a ratchet.
The yellow one also has a boom extension which is a hand wheel and an internal acme screw which means it can extend or retract the boom even when fully loaded. It has a 610 lb. counterweight which was a 3” chunk of steel I cut in half and welded together. It sits on a 1.5” thick piece of steel with a 1.5” back bulkhead.
The thing you have to be careful of is the more you design them to lift, the heavier they get and the harder they become to move. I’ve refined these two over many years and they seem to work well.
I also have a large gantry on tracks and a forklift. And even so, I find these two lifts very useful and versatile.
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