Heat pipes only normally need an end welded on if your using a burner / heat gun so you have a 'safe' side to work from and avoid the agony of getting burnt. With a light bulb your not in such peril.
Have you thought of a flexible electric heat mat (at least the same size as the wooden side) sandwiched between two very flexible metal plates which is first heated up with your guitar side and whist the low voltage heat Matt is still on placed on a wooden former and clamped to the right shape?
The main advanteges are you have almost no danger of scorching the wood and you get a consistent shape for both sides / subsequent instruments. There are videos on uTube of this technique.
Have you thought of a flexible electric heat mat (at least the same size as the wooden side) sandwiched between two very flexible metal plates which is first heated up with your guitar side and whist the low voltage heat Matt is still on placed on a wooden former and clamped to the right shape?
The main advanteges are you have almost no danger of scorching the wood and you get a consistent shape for both sides / subsequent instruments. There are videos on uTube of this technique.