If the SCULPT command is used on those surface, the resultant solid has these Mass Properties:
Mass: 155455.2682
Volume: 155455.2682
Bounding box: X: 12.0841 -- 223.0841
Y: -13.1697 -- 30.5203
Z: -21.8450 -- 21.8450
Centroid: X: 138.7405
Y: 8.6753
Z: 0.0000
Moments of inertia: X: 50459107.7812
Y: 3396424895.6044
Z: 3408124547.5257
Products of inertia: XY: -187108033.7765
YZ: 0.0000
ZX: 0.0000
Radii of gyration: X: 18.0164
Y: 147.8115
Z: 148.0659
Principal moments and X-Y-Z directions about centroid:
I: 38759455.8599 along [1.0000 0.0000 0.0000]
J: 404078068.5981 along [0.0000 -0.7071 -0.7071]
K: 404078068.5981 along [0.0000 0.7071 -0.7071]
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May your cursor always snap to the location intended.