We had our Tornado re-tube about 3 years ago. There are a couple of people on here who could help you with it.
Our must have was a change from three to five chambers, hypalon fabric, life lines 2/3 of the way down both sides, four cleat type handles, flat rubbing strake and two large ware patches on top at the rear.
Should have gone for relief valves as we went for a dark colour but this can be changed and anchor guide up front (canít think of the correct name).
Good luck with the project
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