A couple of other things. First of all I'll be uploading a more deployable version of the source very soon. In the meantime, if you are eager to compile the source code on your own machine, be aware that for some reason all the XSI files have the textures hardcoded to reference my machine's specific path. You'll need to change this for Crosswalk to process the models. XSI files are text files, you can just open them in VS and look for the texture declaration blocks:

XSI_Image piratebeard_large_jpg {
        "C:\\Users\\dawate\\Documents\\Visual Studio 2005\\Projects\\GuitarMatey\\GuitarMatey\\content\\textures\\piratebeard_large.jpg",
        1024,
        1024,
        4,

etc.

Just replace those paths to match yours and you'll be good.