Here's mine.....I kept it simple nothing to fancy cost should be lower to CNC. Material 6061-T6. Will I tried to lighten it up some and keep to overall design that I have without changing the basic shape. Update revise part as of 20 May new files have been uploaded

Mass properties of TRIPLE CLAMP ( Part Configuration - Default )

Output coordinate System: -- default --

Density = 0.003 grams per cubic millimeter

Mass = 837.076 grams

Volume = 310028.176 cubic millimeters

Surface area = 80566.467 millimeters^2

Center of mass: ( millimeters )
X = 0.009
Y = -3.749
Z = 29.275

Principal axes of inertia and principal moments of inertia: ( grams * square millimeters )
Taken at the center of mass.
Ix = (1.000, -0.000, -0.000) Px = 699717.044
Iy = (-0.000, -0.256, -0.967) Py = 6288838.249
Iz = (0.000, 0.967, -0.256) Pz = 6775965.183

Moments of inertia: ( grams * square millimeters )
Taken at the center of mass and aligned with the output coordinate system.
Lxx = 699717.056 Lxy = -150.678 Lxz = -208.965
Lyx = -150.678 Lyy = 6743931.412 Lyz = 120740.837
Lzx = -208.965 Lzy = 120740.837 Lzz = 6320872.008

Moments of inertia: ( grams * square millimeters )
Taken at the output coordinate system.
Ixx = 1428890.170 Ixy = -177.959 Ixz = 4.065
Iyx = -177.959 Iyy = 7461339.808 Iyz = 28870.533
Izx = 4.065 Izy = 28870.533 Izz = 6332636.853