The first step is to always generate the chain geometry along the (say) Z axis, then rotate/translate into position.

If you parameterise the dimensions of a single link properly, it's not hard to work out the correct spacing.
The minimum set is :-

1. Curved section radius
2. Straight section length
3. Radius of the link

Attached is a short segement (4 links), the interesting rotation of an individual link is about the x axis, IIRC.