This pains me greatly to post, but I cannot get the seat post out and I fear I have damaged the seat post clamp beyond repair so I may be unable to continue this project...
If your seat post is alloy you could try caustic soda. Block any vent holes, bolt holes etc and then pout in a crap load of caustic soda then leave it. It'll eat through the alloy while not affecting the frame.
This pains me greatly to post, but I cannot get the seat post out and I fear I have damaged the seat post clamp beyond repair so I may be unable to continue this project...
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