I just booked my intimate wedding at Sunset Point...I was given three options for time 9 am, 1 pm, and 3 pm. I originally wanted 6 pm, but I got the impression that they don't do intimates after 4 pm. Customs are, of course, a different animal altogether...you probably have a few more options.
I think I read somewhere that someone did a custom at Sunset Point with about 75 guests, so if you have about that number of guests (or less), it might be able to be done.
Good Luck!