There are very few cameras with a build quality like the F3 that is obvious the moment you exercise it. Although it doesn't differ much in size to Nikon's smallest (FG/EM/FG20) and medium (FM/FE/FA) size SLRs, there is a substantial difference in weight that will be obvious if you have them hanging on your neck.
Keep in mind that the F3 system uses a special flash shoe. Although there are adapters for standard shoe flashes, only the hard to find and quite expensive AS-17 enables TTL capable flash to work on the F3.
These adapters make it convenient to use one flash across F3 and standard shoe bodies but Nikon offered flashes for both.