Fall arrest vrs. work positioning
Nick
You are setting up a ropes course. this means traversing cables, climbing up rope ladders, sliding down angled cables, etc.
Really what a rope course is set up to do is bring climbers up into a tree using preset rigging.
For the most part, these are Fall arrest systems.
The industry has complete set ups for this.
Steel double locking snaps, Delta rings (webbing or steel (by the way steel delta links set between the shoulder blades have been shown to break the users back if they take a direct fall onto their back- webbing is better)). The senario you described uses a set up commonly used by rebar workers. They have two lanyards and clip and unclip to move about on walls of rebar such as freeway structures. The primary attachment is the delta link behind the shoulder blades.
Try a local industrial safety supply store you will be amazed at what they have.
Mixing two disciplines and the gear used is tricky and should be done with full knowledge of both trades. You mentioned that alum. biners wear out running on a cable- that is a great example.
Tom Dunlop has done a geat deal of work with the standards and they have defined these two trades very well.
climb safe, especially with new climbers
Frans