I just read on the LeMaker forum that the connectors are for the 40 pin flex cables like on the Banana Pi & Pro.
I based my earlier report on the schematic showing 42 pin connectors, as they listed the solder tabs as well.
Apparently the Banana Pi Camera and the 7″ Banana Pro LCD is compatible with the Guitar Base Board. (The 3.5″ and 5″ displays are not compatible as they are not LVDS displays)
The 3.5″ and 5″ displays are not compatible as they are not LVDS displays.