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In my opinion this is far to complicated and unnecessary expensive. And will likely result in an uneven surface. It is quite difficult to sand a tube perfectly round without a jig.
I would take a kg type tube (used in plumbing) wich you can get at 300mm diameter and 1,5m length. The finish isn't that great, but it's straight and even. Wich will be hard to achieve with your method. Then take the mold, remove the tube, trim the edges and close the mould again. In this closed state, start sanding the mould beginning with 400grit. This ensures, that your flange edges stay sharp. Then use high grits. 800, 1000, 1500 and finally 2000. Finally take the mould apart and polish it up to high gloss. This will give you a nice finish.
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