Quick and Dirty method of creating Sloping Runways

I've been making a couple of Aircraft Landing Areas way out in the bush and I came up with the following fairly stupid method of making uneven runways. 1. Use SceneGenX to define a scenery area with lat. lon.2. Create an airport object with the lat. lon. plus database details: Name, city, region, ICAO code etc. 3. Do NOT create any runway objects etc. 4. compile to bgls. 5. Go into Ground2k4 or similar and define a landclass for the locality. 6. Lay down a straight dirt road segment for your runway, going across your airport object lat. and lon. Make it wide, around 128 feet or more. Your runway will follow hills and have bumps and dust and... generally be really nasty. Now if only I could work out some way to harden it - I tried landing a dc3 on it and it nearly worked only she sank into the ground at the end. Che