Any ideas on how I could attach this to an LR4? Any thoughts? I know its meant for the defender and it has specific holes on the body to make it work but do you think something could be done to attach to an Lr4?

How could it be done?

Does a roof rack exist that has side rails to attache?

 

The factory roof rails may work for the upper attachment points, the lower points if they clear the window would be easy to drill the body and install rivnuts.

That being said if you off road keep in mind it will stick out quite a bit due to the slab side of the LR3/4 and would be prime picking for random trail trees