Sorry I had moved my post as you were applying(moved to the eames chair real v fake thread.
The 7kg wasn´t just the rubber mounts, it was 7kg overall. On a chair like that shaving weight only means shaving cost.
If thats a compromise to quality then there is a problem. Theoretically you could replace the plywood with carbon fibre and the aluminium
with titanium. Considering the energy and cost of moulding the plywood I can imagine carbon being slightly cheaper. That would...