This post by 'Bretty' over on the vyak forums has a video that shows how to use the Hobie upgrade kit. http://www.vyak.net/forum/viewtopic.php?f=11&t=13400
So am I right in thinking that Hobie have released a genuine upgrade kit to enable anyone to upgrade?? From what I can gather the kit includes the pvc caps to reinforce the seat holes.
I have had some pvc electrical caps stored away for years - just in case I ever needed them so I will proceed with this regardless.
Thanks guys for the info and advice