Jeff - you have bought a small piece of RIB history if those tubes are from the Rib for Mcmillan. Several of us have crawled over aorund and under your tubes before Henshaw worked thier magic on tubes on hull. I'm you know al this stuff
There are several youtube type films showing how to attach them.
Another option maybe is to flyover spend a few days here and see if someone could let you watch how they do it - then head home and do it yourself ?
The 'cost' of Chris to send someone over to do it may not be such a bad idea - his guys are among the world leading experts in all things inflatable