hair dryer is no where nar hot enough the mold lexan you would need a heat gun.

Other than buy a longer body I can't suggest much IMO it will prolly look like crap I've had this dilemma a few times I just ended up looking for a longer body.
I've thought about building a vacuum forming machine, and making a mold out of a body, and just stretching it and scuplting a filler for the new section, but I figured it would be too much work and cost too much in the end