If I can just point out, there are a couple of plastic plugs either side of where the passenger puts their hands,two either side of the bike,
So, these are tapped 8mm thread, They are intended for the pannier bag attachments (I think) But we can utilise them for Bungie Bobbins, that way it's much easier to strap your stuff on,
I've removed the seat for clarity, The gap in between the two bungs is where the passenger steadies themselves Gill,
Hope this will be of some help, I shall make 4 s/steel bobbins to fit, that way it's pretty easy to fasten stuff on,