Allright.
I assume you’re going for ArchVis and not game development, because this isn’t a gameready asset for sure.
I’ve also found the same model online: http://dimensiva.com/side-chair-by-vitra-eames/
For this guide i used your version.
Sorry for the interface beeing german, but i don’t want to change the program language everytime i post a pic of it on the internet.
Attention big image file incomming:
http://i.imgur.com/MCpEeAO.jpg
For the sake of learning, i’d recomend you to download the model in the link above, since it is untriangulated and because of that better suited for editing.
80k polygons is a lot, even for ArchVis, so i’d recomend you to do some optimizing at least.
Take out unseen faces (like the back face of the screws), reduce unneccessary edgeloops by selecting them with the loop selection tool and disolve them.
Do a proper UV map, at least for the major parts.
I’d say with some effort put into it, you can bring this down to 1/2 ir 1/3 of the curent polycount without noticably loosing detail.