If you built a slider then you can use the Meske tip-up mod. Works great for rear access.
I don't remember who did it, but someone replaced the rear canopy window of a tipup with gull-wing baggage doors. It is structurally sound, and certainly makes access easy. I saw pics of it, and it looks decent, too.
Go to http://www.kitplaneparts.com for some pictures of a baggage compartment on a tip up. DH
Is it possible (or recommended) to cut side doors into a -9's baggage area? Going over the seats seems awkward.