The handlebars are original and replated. They wouldn't be too difficult to fab with some 7/8" tubing and a bender.
Thanks for reminding me to update this thread. The subject trikes have basically been completed for a while. I just got the final seats back from upholstery shop a couple of months ago. One unit has been residing on my lift table for many months with body off for some minor tweaks that never seem to move up the priorty list. I'll try and get some updated photos posted to wrap up this project.