Hi Mus,
I see you have been looking into rovers, I would certainly second the recommendation for AION Robotics,
With the cube fitted it comes to about £1000, depending on the exchange rate, and you might get stung for tax ontop when you import it. This would certainty be a very capable rover, and would be ready to go out of the box (would still need a bit of work to fit your sensor).
I have recently started a small business working on unmanned vehicles, we could certainly fit your sensor (and a autopilot if necessary) to this or another rover platform to provide a fully working system with tech support and/or provide some training on the hardware and how to operate Ardupilot (we are based in South Wales but could travel).
I will of course do my best to answer any questions you have about rover set up here on the forum in my spare time so fire away.