That's one of my biggest gripes! Sellers who have a "for parts" condition trike but are still asking a price as if it were complete and in very good overall condition. Nobody in their right mind is going to spend hundreds on a tricycle that's missing important parts that may never be found. Shawn, you're absolutely right about the difficulty in finding early trike parts. They would pretty much have to be made from scratch IF you had the tools and knowledge to reproduce them.
Dave