Steel bow string? Eugh...
In my novice days making Crossbows I messed with them...horrid things.
I saw a bow made of pre-stressed concrete once (yes really, it was made to demonstrate the remarkable properties of the material) which had a bowden cable string.
I don't really know why a steel bow needs a steel string. My 275 lb draw weight crossbow does fine with Dacron (ok the string is about 1/4" thick
). And all the medieval crossbows managed without, some of them drawing 1,200 lb (cf Ralph Payne Gallwey)
Steel cable can chaffe and fray and it's a pig to make loops.
I wouldn't touch it with a barge pole, appart from that it's fine.
Or was a steel string an authenic part of the kit? (even if so I'd be tempted to use poetic license)
Del