Hi Jacobi,
We have a 2120SC and carry our 8'6" inflatable on our cabin top.I modified the boat by removing rocket launchers(we don't fish) and also changed the anchor light to one with more height and moved it to one side so I could leave the inflatable on top while running at night.You will probably not have to do much to your boat because your top is much larger then ours.We put a cover on our inflatable then lash it down with webbed straps from one handle to the other.With the cover on the inflatable we store our westsuits,fins,snorkle mask, and outboard and misc wet stuff.I'm not crazy about the way the inflatable looks on top of the cabin but it is better then inflating/de-flating when we need it.My wife and I can pull the inflatable over the bow rail and set it on top of the V birth then lift and slide it onto the cabin top.I have put it up there by myself but it is easier with two sets of hands.Good luck and let me know what you come up with.
Your 2520XL is one sweet boat
Barry