I am nearly complete building my pond. It occurred to me that it may be difficult to access the center, in case some maintenance is needed. I can buy an inflatable raft. One solution I considered is putting some 1x1 ft square paver stones done in a line, then put the liner above it, then when I walk on the liner, it reduces the chance of damaging the liner. Do you think this will be of benefit to prevent the liner from being harmed while walking on it? I will buy 45 Mil EPDM liner with underlayment under that.