Let ABCDEFGH be a unit cube where A is directly above E, B is directly above F, C is directly above G, and D is directly above H. Let X, Y, and Z be on AG, BH, and CE, respectively such that XG/XA=3/2, YH/YB=2, and ZE/ZC=3. Let O denote the center of the cube. Then find the surface area of tetrahedron OXYZ.