hearing about split stays got me thinking (which is not a good thing sometimes lol) I wonder if we could do a split stay in POR....half Royal Room and half AB?
Would that be like a huge pain in the butt or would POR make it easy by picking up our luggage & delivering it to the new room while we are in the parks?
I think it would be nice to try out the AB so princess can sleep on the murphy bed and my MIL can sleep in her own bed.
Since they won't guarantee a certain location, is it possible you could be placed in a non-royal room mansion room

That would defeat your purpose unless you booked preferred to be sure to be in AB.
I don't think it's that big a pain in the butt, when we go on non-WDW trips and do road trips, we'll spend the night or 2 at a hotel, pack up and head for the next destination & so on and so forth during our trip. This was how I talked myself into our first split stay, we're at POP and then moving POR royal room for the end of our AUG trip.
While it may be a pain to others to pack up, move and recheck in, we're just using it as a day to slow down a bit. Move day we're going to sleep in then make luggage arrangments then go to DTD for lunch at TRex. Then ride the boat over to enter PORiverside by boat, instead of bus. I think it'll be a great way to see the resort for the first time. I'm really looking forward to this part of our trip actually
Then I guess you would not like what we have planned. 5 nights at POP with free dinning then 3 nights at the Double Tree Hilton (near the convention center) for Star Wars Celebration. That was originally the end of our vacation but we enjoyed POR so much we added 5 nights at POR with free dinning for after SW Celebration. So three rooms in less then two weeks.
I wonder is it possible to send some of our luggage from POP to POR and have them store it for a few days for us?
Sounds like a fun trip to me

Plus aren't you smart adding those days now you can use ME for both legs of your trip (if you're flying). I'm not sure how many days they would store luggage but I do know from checking into our split stay they will arrange to transfer luggage for you.
Sounds like you do as we do when we're going to more than one place, we organize our luggage so we have it packed for where we'll be. Biggest suitcase holds the lion share of the clothes we'll use for the resort we'll be at the longest, then for a 1-2 day resort, we'll use an overnight bag.