I build this rack about 6 years ago(1996) and i use it a lot,from carrying my own bikes,to help on races,actually i use to do tune-ups on certain friends bikes and use this as a pick-up vehicle,is very use full,actually got my BUTT out of bed many times and made my go on many trips,long and short to ride my bikes.
I have a bunch of ''Pat pend's"on it but because is such a "hot potato"in terms of liavility I never got to developed (to much risk and legal repercution)
I will post detail photos,so you can make your own,for sure I do not want to make them,no energy to deal with legal CRAPola