I think i could get this done with Unity's Ray System. Pretty much the same way BD Armory works, The tricky part for me would be the Kerbal Integration. It might take me a bit to figure out all the different options inside kerbal i.e.(What to look for, how far away. That kinda thing) other than some bumps this should be a pretty smooth ride. PM me if you want me to help. EDIT: Forgot to mention, this method should not require any parts or planets to be modified. just the prox sensor.