Hi Archie
You can contact Kevin Taylor at Taylor ent. in Iowa
PM me for his contact details. he builds all type of fixturing equipment like that and very good quality and accuracy 2nd to none
I have had him build me a ton of fixtures for my BHJ stuff better then anyone else and corrected a bunch of issues as well.

Way more cost effective then Goodson and other retailers of shop fixtures as well.

Look forward to hearing from you.
PS sunny and a light breeze up here perfect summer weather lol

Dave C