The Cessna is a great plane on floats and if you allready fly you shouldn't have any problems flying off water. Just hold up in the elevator till it gets a little speed then start letting it off to get up on step, then just a bit of elevator and you are flying. On landings I liked to keep a bit of speed on and fly it in, it's fun to drop it in but it looks better when flown in.
I had an OS 91 4c on mine and Loved it, it was a bit tight getting it in but it fit fine, I can't speak for the Sato but I have heard that it fit a little tighter then the OS. I also know of a couple that put 61's in and they were happy with them so you should be fine either way.
By the way in case you need parts or anything Falcon is out of the picture and Hobby People now sell those planes that Falcon had.

If I can be of any help with the Cessna or any of the ARC/ Model fly planes just let me know, I've had them all and have flown them ever since they came to the States. ENJOY !!! RED