That is a lot to squeeze into 3 requests - think I would drop the second part of the Cabana request. Would drop Rancho's because it is likely if the other requests are not available they will likely put you there anyway.
A CM on the DIS suggests going to regular check-in and do
not do on line check-in since that is for quick document pick up. This will make is easier for the CM to help find a room in an area you would really like, if not already assigned.

I'd bet the kids will love Cabana's once you are there..so why not simply request:
1. Cabana 8B
2. Cabana 8A
3. 1st or 2nd floor.
Good luck and have a great trip!!