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Joe,
since you're pretty confident that the spar profile is right, I think I would assume that the sides ARE vertical and include the edges in your point geometry for curve-fitting to arrive at the rib geometry. Clearly you will need to move the profile up and down to get a best fit. Do this with both spars if the front spar top or bottom is sloped.
think about it. If they could have the slope on top and bottom any angle they want, why wouldn't the sides be vertical? You have to start somewhere.
I seem to remember that there are several methods for fitting curves to data points and it would be nice to know if Sopwith specified one.
good luck with this, John
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