Dan,
Not thick (necessarily
). If I understand you correctly, what you need to do is this.
1. In LR, select the photos you want to send
2. Choose File -> Export as Catalog...
3. In the dialog, make sure that "Export selected files only" and "Export negative files" are ticked
4. Name the exported catalog and click "Export catalog"
5. There will now be a folder in the location you specified, which contains an LR catalog and the raws. Zip it (right-click and compress)
6. Send the zipped file. Nothing else should be necessary.
At the other end,
7. Unzip, by double-clicking the zipped file
8. Start LR as usual, with the usual catalog
9. Choose File -> Import from Another Catalog...
10. Select the new catalog and import
You should end up with the raw file and all its edits in the new catalog.
Jeremy