Kai Tak has been on my TODO list for ages! I'm willing to help, provided you do your share.
1. We need to get the land cover right. Currently it is offset (and coarse),
http://mapserver.flightgear.org/map/?lo ... 58&zoom=12but OSM has good data. I suggest you find Terragear experts that are willing to generate terrain, or read up on how to do this yourself.
2. The quickest way to get some more scenery objects for VHXX is osm2city. OSM has some buildings, but I lack apropriate textures. Since you live in Hong Kong, it'd be great if you could take photos. Lots of them. Or search the net and ask for permission to release as GPL. Then extract textures from them. See
http://wiki.flightgear.org/Howto:Create ... rom_photos on how to take good photos for texture extraction.
3. I also have converted MSFS (or X-Plane) scenery, which includes the checkerboard hill and the sports complex. I could try to dig that up and ask the original author for permission.
4. Some time ago I made the curved lead-in lights. A night approach to VHXX using them is pretty awesome!
5. I also have the (once) freeware 9 dragons scenery sitting around somewhere. I never got around to even unzip the archives though. I'm quite confident that could be converted to FG. You could try and contact 9 dragons and ask for permission to release a converted FG version under the GPL.
If you are willing to go forward with that, create a gitorious repository or a shared dropbox folder and probably also a wiki page, and I'll upload the GPL'd stuff I've got so far.
VHXX with OSM buildings and the converted MSFS scenery: