My advice would be to try and contact someone from a local camera club who holds a distinction with the RPS. You could show them your work and method of presentation and ask for their advice. To be honest I think a panel of 8x10 RC prints mounted for the first time would have the odds stacked against it, unless the work is extraordinary original. I believe that the RPS run workshops on preparing panels and perhaps this might be another option for you to try. Good luck with your panel in any case.