DR, I don't know much about the differences between the DE and the CE, so not much help there.
However, your approach to build as light as possible is a noble one regarding either plane.
We built our DE and it got heavy. It has a full featured engine, a bunch of instruments and doors. But, it does fly well, but a passenger needs to be on the light side.
Don't know where you live. Ours is in Louisville, Ky, and we have winters here. So, the doors were put on to allow year-round flying in relative comfort, as compared to open cockpit. Actually, the doors make longer flights more enjoyable, less fatiguing.
Hope that helps some.