Do you even know anything about how the Basic Model and Chunk Model formats work? If you did, I imagine you wouldn't have tried converting it manually, because the formats are fundamentally incompatible, you would need a conversion tool. As to the existence of such a tool, I tried making a LevelConverter tool for LandTables a while back, but it doesn't quite work. A ModelConverter tool could be in the cards if I can figure out how to fix the conversion. If you're thinking you can bypass the inability to import custom models to SA2 by just porting models imported for the Basic Model, it doesn't work that way. Our importer imports models as triangle lists, which are supported by the Basic Model, but the Chunk Model only supports triangle strips, so we would need to implement a conversion function, and at that point, I could write a Chunk Model importer anyway. If you just want to port SA1 models to SA2, that might work, depending on the model. Most only use triangle strips, but there are a few odd ones.