My **Spline Blueprints, Railings, Fences **marketplace package is currently a showcase product. It’s also on sale. It has quite a few high quality sets of railings and fences. The main feature is a generic spline blueprint that lets you clone meshes along a spline in many ways. There are example maps in the package. One scene contains many examples for the generic blueprint, the other scene shows examples for the railing blueprint (which is a bit different).
I made 4 examples with recorded video tutorials to get an idea what you can do with it.
The package is currently available from 4.25 onwards. I may do a 4.23 version if enough people express interest.