Re-found my only vintage RC10 today

1) Why does the chassis have unused holes under the gear box at the rear?
2) Why are the rear inner hinge pins too long? They stick out further than the wishbones (they do have both "E" clips fitted)

3) Why is there a plastic nut on the pivot block fixing screw? Is this usual?!
4) The bulkhead moulding where the turnbuckles go in has been trimmed back for some reason. Are these particularly rare/expensive to replace?

5) Rear tower was coloured black with a Sharpey. Same as before - are these towers cheap & easy to get hold?

General piccies:


YAAAARGGHH!! Posted using the "wrap box in parceltape and hope the postman doesn't steal it" technique....

Cheers,
Ian