I don't know of any carriage hires personally, but I talked to Stone about it and he was able to get me the name of one his mother has used in the past for some event or another. The place looks pretty good, and they even have a big carriage that can seat twelve people if we want to take that option: http://www.carriagerental.com/images/carriage1.jpg
I looked at the doc and added in the cost of the carriage rental options, as well as my estimates about the shortfall. I also tweaked the proposal here and there, but overall it looks good.
I do agree that we can do this. Should we go asking around the Square this weekend?