For the Wasp just enlarge the plans to a 48 wing . I am in the middle of building one that size as we speak

. Will be putting either a YS. 91 or a Saito .80 or .91. And the plans call for you to sandwitch two pieces of balsa with glass and epoxy. But to save weight you would be better off stick building the fuse.
Have a great day all going flying it is 75 F here lol he he he