If you want to make better economy this is a bad start.
Think about it, a new players come to play but no one could find an old saw blade, they will be frustrated and leave the game.
I understand some people "in big tribes" got so many in stock and now they need to sell those, but that doesn't mean xsyon would have to make saw blades rare in order to force people to trade in order to "please" some people.
All componets should have 70% chance on scraps and 30% chance all other, 6 and more is to many, make them up to 3.
About revs, can we skin revs for human bones? after all they do look like humans.