I'm working on the educational exhibit signage for a forest-preserve visitor center. The forest preserve has a book of branding standards, but the standards seem to apply mostly to outdoor interpretive signage, not indoor exhibits. The original instruction we were given from the client was to come up with an original design for the exhibit, but later on they went back on that instruction and asked us to design using the brand standards for the county forest preserves.
My boss thinks that it would be better if we were able to design the exhibit using a design direction chosen by us, rather than the standards provided, and wants me to come up with a few arguments for doing this instead of using the forest preserve’s standards. As for precedents, the last couple of redesigns of nature-center exhibits (by the forest preserve) did not use the standards. The older nature centers have a mix of forest-preserve signage and DIY signage printed or painted by the staff.
I am aware that we eventually have to make the decision ourselves based on the specific situation, but we want to consider all the relevant points. Therefore I am asking: What are general important points to consider for or against using existing standards in a situation as outlined above? What are possible arguments for having a different graphic look and feel for the nature-center exhibit?