Assuming this is Rutan's X Prize vehicle, it won't fly into space itself. Instead, it would carry a rocket to high altitude similar to how a B-52 carried the X-15 for launch. Rutan built an earlier aircraft called the Proteus that was supposed to be the launcher for his X Prize entry. Perhaps this new plane has nothing to do with the X Prize, or perhaps it's better suited for the job.

Rutan is a master engineer who pioneered the use of composites to build strong, lightweight structures. His designs have a great reputation for being well engineered. The plane is no stronger than it needs to be, but certainly strong enough to do the intended job.