Rock 'n' Roll Bed Part 2

I've done copious amounts of research on how the California Seat should be fitted to the van.   On good advice from someone who fits these down in Oxford, you need about 7 or 8 bolts per rail.  The rails I have, only had four bolts per rail and no nuts included, so, I needed to order these from my local VW dealer.  8 more bolts and 16 nuts.  Came to an eye watering £56 inclusive of the VAT.  If you don't have any of the proper high tensile steel bolts, these are the one's you'll need:-

http://www.banwy.co.uk/product/t5-parts/Seats/bolt-m10-x-28-square-head-caravelle-rails

and these nuts:-

http://www.banwy.co.uk/product/t5-parts/Seats/kombi-floor-bracket-nut-fixings

Then I looked into the fittings, which are required for the underneath of the van to distribute the load and ensure the bolts don't just rip through the floor in the event of a crash.  The brackets I need are four of these, which are all proper VW rail brackets:-

http://www.banwy.co.uk/product/mirrors/Seats/floor-reinforcer-mounting-strengthening-seats

and four of these smaller brackets, also proper V Dub:-

http://www.banwy.co.uk/product/mirrors/Seats/seat-floor-reinforcement-fittings-kombi

You can see the brackets (1) and (14),(15) which I have ordered above.