Ok, now that I've bored everyone to tears about the different types of derricks (this is far from all of them), and shown how they have advanced to their modern forms, I'm going to attempt to show more easily achieved versions. Here's an old tool catalog, where they would sell just the ironwork for adding to timbers, or everything all ready to go. The most common derricks were all wooden, until the skyscraper boom was in full swing and companies started specializing in that particular industry. Even then, wooden spars were occasionally used. As we all know, wood is an ideal material, being light and resilient and capable of enormous compression loads. Since all the connections are at the ends of the spars, there is no cantilever loading.
Somewhere I have actual blueprints of a 10 ton or so stiffleg, with wooden spars, so if I can find it I'll add that too. The point is that the hardware can be simply welded up and then bolted to either dimensional lumber or logs whittled on a chainsaw mill. Or used as is. You still have the winching mechanism to add, but the basic structure could actually be built from scrap.
I'll get into anchors and winching setups tomorrow if I have time, if not, in the next few days. I've found some really cool and cheap setups, or if you could find a few used Braden winches or something, for the cost of them, some pulleys, and wire rope, you could build a yard crane that would work surprisingly well. Even more so if you use a remote control, a wireless one like August uses on his truck would be almost too cool to handle lol.
And finally here's a video of one in a quarry, doing duty cycle work all day every day. They are using extra winch lines to drift the load out of the pit, and to position the lift to where they need. Kinda like the trivect rigging in reverse, and on a swing yarder, which is nothing but a guy derrick.
https://youtu.be/x_rBBLA4aHo
Just do it!!
. He was fairly new to the Mt. Hood NF at that point, didn't know his opponent's skills well yet 
