Ohh.. the slices are made keeping z-axis as above figures but they all seems to be simple block when viewed individual slices in Cut3D.. i dont know why??/ But now i changed the orientation of the model as per figure below and slices made were workable.
Now i will make test pieces of half of the Top portion of model. And the only tool i will use ballmill 6mm with following configuration.
Rough cut: 6mm ball nose with 30% stepover
Finish Cut: same 6mm ball nose with 15% stepover
Cut out: 6mm ball nose
I will use 12.5mm MDF board ( I hate MDF due to pollution it create)
The Feedrate will be 100IPM and the plunge ratewill be 20 IPM.