It will cost you a snorkel trip if it works out. What are the dimensions of a 720? Is anything in it yet and show off some pics...
If you do decide to go the 2 skimmer route, I do have a used Warner Marine AS-300 skimmer with the 12" body. Took it offline a while back. It's a beast of a skimmer but I decided to use something a bit smaller. Has dual Sicce pumps that are less than a year old along with the original Sedra 9000's. $250 OBO.