I dug up some old A8 project which converts A3 levels to meshes. Now I added import scripts for Unity.
It is not quite finished yet (e.g. classic A3 ambient/albedo lighting still missing), but it comes surprisingly close to the original.

[video:youtube]https://www.youtube.com/watch?v=daXrBOkYnPM[/video]

Not that this is of much use, but I needed to do sth while being on sick leave...