An LA 15 will easily fly an F2D model on 52.25ft lines. That's 410 or so squares. 235 is too small. An F2D wing is built much stronger than needed for a stunter, so 350-400 is right in the ballpark. Lightening the wing makes up for adding a fuselage.
The original Magican was built pretty light, and the wing to tail was a bit on the short side, especially if you use the flaps. It's much simpler no to. So it sounds like the smaller plane is a better rendition of the Magician.
Your best bet for changing the size of the plane is to take the Magician plans to a local, small, quick-print shop. They can scan the plans into a computer file and then print them to any size you want, keeping everything in proportion.
I still use an ancient Epson 510 dot matrix printer to "tile" print a working copy of plans and parts.