You'll find that this concept is extremely difficult, for quite a few reasons. 1. Wing shape: Wings are specifically designed with a shape that matches their profile. Wingtips, the thickness and curve of the wings, flight controls and high-lift devices are all designed to maximise their effectiveness in a certain profile. If a wing that was designed for rearward sweep was swept forward, I don't know if you'd actually be able to fly with it. 2. Centre of gravity: One of the major considerations with aircraft is centra of gravity. The wings develop lift, which allows the aircraft to fly. However, this lift acts at the point around the average centre of lift of the wings. So if a wing was mounted in the very centre of an aircraft, but swept back 45 degrees, the 'centre of lift' would act at a point halfway between the front and rear of the wing. When aircraft are designed, great consideration is given to the wing profile and location. If you were to invert the sweep of wings (by swinging from rear to front) you would greatly disturb the centre of lift and centre of gravity of the aircraft to the point where it would become unflyable. 3. Stress: Forward swept wings are subject to incredible stresses that rear swept wings are not affected by. This is why relatively few FSW aircraft have ever been produced. The advent of carbon fibre composites has made FSW somewhat more practical, but it still has its own problems. If you were to make a forward swept wing out of metal, as soon as it had reasonable airflow over it, the stresses would bend the wingtips up as easily as bending a plastic spoon with your fingers. The wings would then pretty much just rip off the plane. That's how incredible the stresses are. Carbon Fibre gives enough stiffness and rigidity to withstand these stresses. 4. Stress, part 2. Variable geometry winged aircraft are required to have incredibly strong mounting points for their wings. The F-111 Aardvark has a pair of huge, high tensile steel mounting points to attach the wings to. I don't know how strong mounting points would have to be for Forward Swept variable geometry wings. It would be horrendous. 5. Design: Part of the design of the wing is the design of "Wing Roots". These are the part of the body that give the wing/aircraft connection an aerodynamic join. The complexity of designing wing roots to maintain optimum airflow over that area for a wing that sweeps back and forward would be even more horrendous. 6. Practicality: With the technology available today, there is no need for such technology. In fact, you'll find the use of variable geometry (swing) wings declining throughout the world. While FSW are still pretty much being experimented with and only rarely used, the current trend is to build aircraft with negative stability and a rear-wing/front canard design. What this means is that instead of having the wings up front/middle, and then the tail at the back, the wings are moved back, and canards are added up front. (Canards are miniature wings, like tail fins, that mount forward of the wings, often towards the very front of the aircraft.)