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@Howard
I believe the rim strip should be pulled taught across the entire surface of the rim. I'd try to find a tube that will ride up into the beadsocket too, so basically inner rim width plus 4mm or something.
You can get a feel for how much tape you need by pushing the tyre out of the bead socket and into the centre channel and looking at how much slack the tire has. The rim tape plus the strip needs to fill the slack, so that when you start to put air into the tyre there's enough of a seal, even when the tyre is in the centre channel, to allow the tyre to inflate.