by hatch or door 69 which may close compartments 68 while allowing access thereto in some embodiments one or both of right and left substructures 30 40 may include one or more upper equipment support cantilevers 67 as depicted in fig1 each upper equipment support cantilever 67 may be hingedly coupled to one of right or left substructure 30 40 in some embodiments upper equipment support cantilevers 67 may be utilized to support one or more pieces of drilling rig equipment mechanically coupled to upper support cantilevers 67 including one or more of for example and without limitation mud process equipment 100 choke manifold 102 accumulator 104 mud gas separators process tanks trip tanks drill line spoolers hpu 39 s vfd or driller 39 s cabin 106 fig2 depicts an overhead view of drilling rig 10 consistent with at least one embodiment of the present disclosure in which v door side 22 of drilling rig 10 drilling rig floor 20 and tank support structure 80 are shown in some embodiments choke manifold 102 may likewise be located on the rig floor in some embodiments accumulator 104 may likewise be located on the rig floor in some embodiments substructures 30 40 may be fixed as depicted in fig1 in some embodiments as depicted in fig3 substructures 30 u2032 40 u2032 may pivotably support drill rig floor 20 drill rig floor 20 may be pivotably coupled to one or more lower boxes 130 by a plurality of struts 140.