the attachment points for the retractor attachment points do not look very robust.
well, it is a Lotus...... what was it Chapman used to say ? "if it survives every race without failing as it crosses the line, it's over-engineered" ? (or something like that)
The top bolt and where it goes is exactly what I have with the static belts, the latest shots you've posted confirm that very well. As for the bottom bolt, well, that does look a bit, er, "interesting" ??
However now that I can see how they are mounted I have a good base to work from. But my first job is to order up one of these installation kits and see what comes in the pack, apparently they all meet the modern regulations for such things. (it'll probably be the strongest thing on the car !!! )
Brian