Unfinished changes.

config.scad

@@ -126,6 +126,7 @@ SECOND_MOMENT_OF_AREA_BEAM =
 ;
 echo("SECOND_MOMENT_OF_AREA_BEAM: ", SECOND_MOMENT_OF_AREA_BEAM);
 
+R_BASE_PLATE = [R_EXTERNAL[0], R_EXTERNAL[1], 3];
 
 T_DOOR = T_HDPE_SHEET + T_GASKET_RUBBER;
 echo("T_DOOR: ", T_DOOR, "mm");