I'm also thinking about how to do the floor. Can't decide whether to go aluminium (apparently Westfield etc do) which runs a risk of corrosion because of contact with the steel, or steel - which doesn't - but does run a risk of good old fashioned tinworm.
Seems people have done both - and no-one can make a great case that one is better than the other!!!
It looks like putting extra support for seat runners is a good idea - although if you have box section I think you then need crush tubes - so I will just be using some strips of 3mm steel.
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