The crack busted back open this weekend, but I'm not (too) depressed about it because of what I'v learned. The tourpak is NOT made of ABS like I thought. It's a product called GTX (made of Polyphenylene Ether + Polyamide) and the products that you would use on ABS plastics will not work on this. All the ABS pieces I glued on with Oates ABS cement came loose and were not giving any support so the crack split open again. That's the bad news. The good news is there is a way to fix GTX material and hopefully not too difficult. I just found out about this, so still have some investigating to do and will let you know what I find out.
....and the quest continues