I have compressed the toast file into a sitx archive, it will unarchive with older versions of Stuffit Expander but may have issues with other apps eg. The Unarchiver for OSX. I do not know how to make a normal .sit archive in the latest Stuffit Deluxe.
Better not use sitx archives. On MacOSX many do not use Stuffit anymore and older versions of Stuffit expander, as used in the emulators, cannot expand sitx. The preferred format for transfer between MacOSX and MacOSX or between MacOSX and other platforms (Windows) is the MacOSX native zip format that you get when using Compress file from the contextual menu in the Finder. Again decompressing in the MacOSX Finder (or with a utility like The Unarchiver) will preserve Mac-specific file properties like resource forks. Decompressing the zip-archive on a different platform will not preserve those properties, but they are useless there anyway. The essential part of a disk image file that can be mounted in SheepShaver by adding it to the Volumes list can do without those Mac-specific properties for that pupose.