As to the question as to whether you can get the rental, the answer is likely including because 1BRs at VWL are usually open at 7 months out for any time in Feb and thus if you cannot find a VWL owner to make the reservation 11 months out, you will likely find someone who is renting that can do it at 7 months out.
As to those sleeping arrangements with five, at VWL you will likely need to figure out how to arrange the five you have in a one bedroom, and possibly bring air matresses or sleeping bags with applicable bedding, because as far as beds go, you have the king in the bedroom and a pull-out queen in the living room. OKW, AKV Kidani and BLT 1BRs, which are larger than the VWL rooms, have an extra twin sized sleeper chair and Kidani and BLT have a second bathroom and for those you would thus need to figure out how your particular group could use the combination of the king, pull out queen, and sleeper chair.