For Tricycles try looking at Rat Rod Bikes for inspiration. There are some mildly modified bikes and some that are wildly modified.
https://www.ratrodbikes.com/
I am saving a Schwinn exercise bike to someday make a trike. My wife said she would leave me if I were riding around on a trike. In her mind, only old folks and drunks ride trikes. My thinking on my future trike build is a pedal powered pickup truck. I don't have any details worked out yet. It may have an electric motor on it.
Please post some pictures of your Worksman.