I am looking to find some documentation on roman furniture. The finds at Herculaneum for example. Kind of like this . Any Scans available of any era ancient furniture?
You should be able to find measurements in excavation reports. I'm not a Roman period archaeologist, but you should be able to look in any excavation report on Roman sites in a library. If the excavators have done their work correctly, a discussion of architecture and artifacts should list any furniture that was excavated, as well as discuss what rooms it was found in and associate it with other artifacts.
Online, there's a lot of info on Pompeii at http://www.pompeiana.org/Research/Research.htm
Specifically, I think you'll be interested in the page on Households. There you can go through each house and look at the list of artifacts of each one, and find measurements of various types of furniture in a list like this one.