Good luck with your project.
I have tried veneer onto a vertical surface and found it fraught with difficulties. Once complete, the project had an amateur look about it, so I returned to using thin plywood with a compatible veneer top layer. Still difficult to fit, but once installed, had a much more professional look.
Unless you have lots of experience with veneers, a plywood material will always be easier to work with.
HDeckrotte, above, always gives good woodworking advice.
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Keith
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