I decided I needed to add some color so here's another picture of the plane/plans.

I agree on the wheels, they should slope back about 5 degrees from the CG, otherwise you will never get a clean landing.  When positioned correctly, your model will sit on the three gear, but if you touch the tail to the ground, it will stay there.

Also, if you need gear that long to clear a 6" prop, your model would seem to be way undersized.

I calculate that you are going to get about 185 sq.in. wing, which is a trifle small (The Pinto has 230 sq.in. and flies great on a Tee Dee .049).  Also, the aspect ratio is around 4.25, which is very low.  With that low aspect ratio, the tail moment is too short and you will have a squirrely model until the CG is so far forward that it won't turn well.

Do what I, and most other successful designers do - scale down a successful big stunter, steal those numbers, then style it and construct it to suit yourself.  There have been a lot of man-years, blood, sweat and shattered balsa spent developing modern stunter proportions.  Darwin was most suredly correct, at least as far as model design is concerned.  You can vary from the numbers if you know what you are trying to achieve by doing so.

Currently, the best performing 1/2A kits are the Baby Pathfinder, Pinto, Hunter Stunter (restyle of the Pinto) and Baby Flite Streak.  All these are scale downs of very successful big models.

Keep on sketching though.  It takes a lot of thought and experience to design a really good model.

I disagree with minnesota modeler on the tail moment, as a longer tail adds only a little weight, allows a farther aft CG, provides more turning power and way better dampening of oscillations.  See my Skyfire and Sky Sport designs.  They both have very long tail moments and large tail surfaces.  They turn hard and stop exactly where you want them.  BTW, RSM is about to kit the Sky Sport.   

We use a huge tail on a short fuselage to great effect on the "Doodle Streak" modification of the ARF Flite Streak.  It works great.  Control is extremely smooth, but powerful and there is no bobble coming out of hard turns.  So yes, it can be done and done well.

However, dampening goes linearly with tail area and is a squared function of tail length.  Half the tail area need only be 1.4 times as far back to have the same effect.  When you have a long fuselage, the tail surface can be built very light, because the forces on it are small.  Always trade-offs!

As for aspect ratio I came up with 4.64 which is between the 2 babies....