Instead of going full NASCAR style ladder door bars, you can make a modified X door bar that protrudes into the door like a NASCAR style, but is lower in the middle making it easier to get in and out of. Porsche does this in their Supercups and GT3 RS. It's not quite as beefy as NASCAR style ladder bars, but much easier to get over while getting into the car. If it's safe enough for Porsche it's safe enough for me...just something else to think about.
If you're going to do track events and not race wheel to wheel for a while, door bars aren't a necessity since the chance of getting t-boned at a HPDE is fairly low. In roughly two years of teaching at HPDEs, I have never seen or heard of two cars coming together.
I have the U bend seat bracket and it's very sturdy. I'll take some pics. of it too possibly tomorrow.
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'92 240sx Improved Touring "S" race car
'89 240sx
etc., etc.
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