A scale value doesn't make sense: it's do or not do it. What I can tell, it's that would be quite expensive as it has many accessories, if you want to be very close to the original.
I was lucky that I could recover many vintage swiss equipments which were almost perfect and cheap. What I could not find or adapt, I had to commission to leatherworkers or tailors.
Some update are still planned for the future. It's to you and your budget to decide how far you want to push