Omori Factory has changed a lot lately. Unless you have an appointment with someone there is very little to do there.
That being said last time I was there in January I did spot an R34 Z-Tune which seemed to be having rear suspension problems so the poor mechanic had to drive it around a lot , also the new Nismo 380RS 3.8 litre stroked 350Z was there being prepared for TAS. Then they rolled out the SuperGT 500 350Z from 2007 season to put it in a truck for transportation. That was fun to see three dudes just pushing a GT500 car around trying not to scrape it on the driveway.
We just got lucky. Usually though you'd be lucky to see whatever car they have in the showroom.
Aaanyways, when I went there in July 05 I was invited to look around in their garage where I snapped a few photos of the R1 R33 but unfortunately it was packed into a tight garage so not great photos.