I have some suggestions for you if you would want to consider doing one up yourself.
I assume you are wanting to do sort of a sport "semi-scale" CL model and not looking to have something to do a serious stunt pattern.
You could use an almost scale wing planform, except the wing on the full size aircraft has a straight center section with a dihedral break sort of mid span. Do you want to go scale? Or do you want to have a simple swept LE and TE. Are you wanting to put flaps on this? I would discourage if this is just for a sport type airplane. With any kind of dummy nacelles on the rear of the fuselage that approach scale size, it will not be for serious stunt. The real airplane has a relatively long nose. Your sport ship will need to shorten that nose significantly, and then you start loosing some of the "scale like" appearance of the full size aircraft.
Just some rough numbers. If you want to have something near shape of the original wing, your initial goal for a span of about 54" will give you around 510 sq in or slightly more, with the same aspect ratio of about 5.6 which is in the aspect ratio range of most stunt ships. (This includes flaps if you use them.) Your number will vary depending on taper ratio, tip shape, and how you deal with the straight center section. And you would probably have no dihedral, unless you want to go "more scale", then you will have to deal with the mid span dihedral brake. Just for starters, your horizontal tail would want to be about 20% of the wing area so that would give you slightly more than 100 sq in. I have an idea the horizontal tail on the full size aircraft is very generous and could even bemore than 20% of the wing area which is good.
Regardless if this is to be sort of a semi-scale or some sort of a sport ship, there will be compromises with that long nose and how to deal with those large rear mounted engine nacelles. There will have to be a lot of compromises, but that is part of the challenge of doing semi-scale CL airplanes. Now, if you just want something like a sport scale airplane, just take a set of 3-views, take them to Kinko's and enlarge them to your 54" span, you will have 510 or so sq in and an airplane that will resemble the A-10 with a propeller in front and the need to put a lot of lead in the tail. Good luck.
Keith