I'm going to mount a plastic fairing extrusion around the top roll bar tube to smooth out the air flowing back to the rear wing.

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I am looking for some ideas on how to cut the extrusion down the entire length. I want to remove the minimum amount of material and make the cut as straight as possible. I want to cut it along the trailing edge like you see in the following pictures.

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I cut the small sample on my band saw, but that won't work for a 4 ft. piece! The only idea I have gotten is to use a 4 ft. hot wire to melt through it.

What ideas you got?