Hi Jen~ I am not sure about the amoutn of people, but I can't see why you wouldn't be able to have it someplace other than the wedding terrace.The North solarium will def be big enough for both, I am just not so sure how they would flip the area from ceremony to reception, bc you can only have buffet outside so it may too much work to be doing while your guests are tight there, maybe you could have your ceremony in the north solarium and the reception in the south solarium.
I did meet with the on-site WC, he was very nice and answered all questions, there are a few WC that work between a few properties, but if you signed your contract and your date is booked, they probably already assigned your WC, It couldn't hurt to ask...I have a lot of information, bc we went for a site visit and then my parrents went for a visit this past week, so combined, we have received so much information, please let me know if you have any questions, I will try to help you.
Happy Planning!
~Tanya