Thanks!
Look what I just built, not very professional, but seems to work just fine.
It's a tube made of inox steel with a 200w halogen bulb and ceramic socket inside, mounted on a piece of spruce.
Still have to practice a little before bending the real sides of the guitar. ¿How much do you soak rosewood before bending? I tried with a piece of RW I got, and sprayed it generously with water on both sides, then started bending and when the wood dried, sprayed again , continued bending and so on until the wood was bent to the desired angle.
Seemed to work fine, but it wasn't a quick task.