I cannot help with a reference or photos, however you might want to check the orientation of the rafters in this area. I am guessing they will be perpendicular to the long walls, which would suggest that the shiplap would need to be installed in the direction of the long walls or additional firring strips or similar would need to be installed so you would have something to attach the shiplap to.
I think Doc's restoration does this type of work, you could try contacting them.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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