Hi mike, another thing that you may run into with IGES format transfer, is that usually even when you have a solid IGES files are transferred using a collection of surfaces and then the receiving application rejoins those surfaces together to make a solid. Because of this it can be problematic to have multiple separate parts that touch each other contained all within the same IGES file. It may be possible for the receiving application to sort things out if you have put them on different levels (called "styles" in MoI), but that may not always be supported. So you may need to write out one file with the wheels for example and it may be problematic to have the front bumper which looks like it is a separate object to be in the same IGES file as the rest of the body.

What program are you trying to get this model into by using IGES format? You might try using STEP format instead, STEP is somewhat newer and is usually set up to work with solids so it can tend to avoid some of these issues.

- Michael