There's not much to say, technically, except that it's a simple bolt-on extension for an adult trike bolt-on read end which bolts on to an alloy front triangle. The rear then has a bolt-on sculptural / painting armature attachment specific to this project.
This phase is a working prototype pursuit, made quickly from things on hand and dormant past projects. A tray is considered as structural. Future fantasy resolution would include a few different profile choices and execution in chromoly.