origin - a 3*1 matrix with user defined x,y,z positions corresponding to origin.
disp - displacement between the edge of the barrel and the edge of the platform
thick - specifies the thickness of the platform.
walkway -
R - Barrel radius
H - Barrel Height
*x : origin{~}0~
*y : origin{~}1~
*z : origin{~}2~
*x : (2(2*R) + (3*disp)
*y : (2R) + walkway + disp
*z : thick
*H{~}barrel~ = H
*x : platform{~}origin0~ - ((3*R) + (2*disp))
*y : platform{~}origin1~ - (R + disp)
*z : platformorigin2~ + platformdim2~
*x: platform{~}origin0~ - (R + disp)
*y : platform{~}origin1~ - (R + disp)
*z : platformorigin2~ + platformdim2~