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I'd say you can do the site plan, and floor plan by yourself, it can be hand sketched.
When I get in on Wed I'll do a quick search of the Bpt. regs for HBB and how they do it. There are no State mandated guidelines for this type of local zoning regulations (unlike Building Codes). HBB Zoning Regulations can be a result of some political expediency, decades of inattention, overreaction to a previous situation, neighborhood pressure and just plain inertia to name a few. I'll let you know what I find out and perhaps offer some suggestions if possible. I'm not as familiar with the "big city" as smaller Towns.