Are you going to do all the floor at once, Cut the lot out as whole or only do 1/4 sections, and are you replacing your sills.
Is it going on a rotisserie or are you just going to level the body up on car stands.
If your doing the whole floor and fitting the body to a rotisserie then you need to brace the body from A pillar to B pillar or back to wheel houses and then cross brace diagonally.
If your are only replacing the floor in sections, then bracing from Pillar to pillar is more than enough. And 25mm by 2mm RHS is more than adequate.
If your placing it on a rotisserie and removing floors and sills then stronger bracing is required. And place your bracing at height that you can have full access to do your work.
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John
EK Holden V8
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