thats my plan exactly, once i figure out the scaling i want to scale a ft spitfire up to a 47 inch wingspan and power it with a .52 size nitro engine.
First step of scaling is fairly simple: get the "Full" drawing (not the tiled one), open it in adobe reader IX or newer, open the print window, select your printer page size and the poster function and set your scale percentage, then adobe reader will create tiled pages in that size. simple and easy.
Then the difficult part comes, which is going through if any of the parts will not fit each other with the changed material thickness. Things may be too wide, or openings be too large. Takes a bit of 3-dimensional thinking, or, in some cases, like the wing cutouts, simply the approach to leave the cut lines uncut on the fuse sides until you have built a wing, and then transfer the final size to the fuse sides before building the fuse.( Do remember the wing narrows a lot towards the tip, the hole needs to be smaller than the wing root to fit snugly. I made a 130% size Depron one......you may guess one time how I know).
Another detail is how to make a proper size and strength spar for the wing.
I'm a bit concerned that a 47" span plane might be a bit small for a .52 engine? 2 or 4 stroke? If it's a 4-stroke it might work out, but I'd feel a span around 52-55" or so would fit better. If it's a 2-stroke, my gut feeling is 60" or thereabouts should be the right size.
But AUW is a big factor. And whether you like it to be "ballistic" or more scale-ish naturally also.