well, I see you included billing, as that could be in house or usually external, so
to that I would add someone to look hard at 2257. since everything else is titled as if it is separate, then
2257 lawyer.
on that note, you again could yourself or externally have the
2257 records keeper,
man that HAS to be the biggest most important thing for those of us who wish to not have huge possible problems later on.
and i'm not even a sig whore, or a lawyer adding this, something must be wrong here
edit: and the most boring aspect? the accountant and tax person(s)