I like to use the dyna mat type stuff first and then the two sided foil with the insulation in between. I just buy it bulk and cut to fit.
As said above fill in the voids so the floors will be flat.
I haven't done it but I think the custom interior guys make the carpet in sections. So the tunnel and floor pieces separate pieces. Then they add ribbing? to the edge to make it look finished. I know locally the carpet shop can add ribbing to custom cut carpet pieces.
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