Once the MESA is covered with its thermal insulation it is fixed onto quadrant 4 of the descent stage. In this particular rendering the simple MESA is installed and needs to be entirely covered (except a hole for the TV camera). If you plan to show the MESA once the astronauts have started to work on the lunar surface, the thermal insulation will be opened showing the instruments inside the MESA. In this case the detailled MESA part will be needed.