I would use Rubbermaids... I've used them for sumps for years...
Also, when you get the new tank in and plumbed, all you really need to do is add the new saltwater you have made, add your l/r, add some bottled bacteria and the water from your bins (assuming your L/r stays in the bins with the fish so it stays live....)
Just make sure if it is a few days or weeks for this process you are keeping up on your water quality in the bins, and do a water change I'd say 3-5 days before transferring everything.
I basically did the same thing with my old system as I kept my tank up in the same room.