Hey Kotharin,
Thanks for responding to my thread earlier. I hope I can help with yours as well.
1. I have the same question, although I haven't heard 60" clear infront of the worktable. I think for now it's probably safe to assume that it is given that most show it that way, and the NCARB passing sample seems to as well. Actually ... after re-reading sbyrktct's site, it seems this was a suggestion from the late Dorf but not proven. *Shrug*
2. I believe this is ok. According to Sbyrktct and Jenny's notes I believe? You can find the former's helpful site below:
http://arehelp.webs.com/sd3. I think laterals are ok as shown as long as they have the sufficient 3'-0" clear to access them in front..
Overall, other than what you pointed out above ... I think this looks like it works. As you mentioned I think you can place the conference tables more efficiently, which may help you in the other areas. I've been trying to follow the program pretty literally, but have challenged myself to give 5'-0" clearance for copier.