I thought i should share this with you. Just the other day I was contemplating the size of the AG ships. So I did some research and used a car for comparison (fig. 1).
fig. 1 (click the image to enbiggen it)
I sized them so that the drivers' heads are equally large. So I concluded that a FEISAR is exactly a bit longer than a '63 Buick Riviera (which was much shorter than my initial guess of about the size of a fighter jetplane).