Thanks for your reply Jan, the boundary / flatten idea whilst retaining some undulations sounds great.
YTDN is not far from home for me, and i wonder if i were to take detailed pictures and measurements if someone with a bit of time, but no experience could create an up to date and accurate likeness of Tooradin?
Also would it be possible to customize the terrain in that area (the real YTDN 04 is almost perfectly flat), or is that something 'underneath' the airport buildings etc.. that can not be influenced?
Cheers.