Many years ago I designed and built several 40 size forward-swept tailless planes. They were all double tapered planform and flew very well, you just need to be sure you have the CG right. I used foam cores sheeted w/ 1/16" balsa and a 6" wide piece of 2 oz glass cloth to reinforce the wing joint. I never had a wing failure and I crash tested a few of them! Most of the airfoils were Evans Simitar series. I also learned that while it was next to impossible to tip-stall the wing, if you're going fast enough and pull a tight enough turn, you can can stall the root of the wing. When that happens, it looks like someone reached up and slapped the plane out of the sky. It just tumbles until you release the elevator and let the wing begin to fly again. Leading edge root extensions (LERX) pretty much stop this from happening.

My only advise would be to design the wing so that about 2/3 of the wing area is behind the CG. If you're designing a plane with a tail, the desired CG is calculated the same as any other wing.