>>6841410Covenant Xeno is much less tube-y, and much more organic than the other ones. So personally I wouldn't use a different one, but he's only 25 bucks on BBTS right now. That's cheap compared to the average cost of a custom project, honestly.
The inside is unimpressive. I didn't remove the neck hinge of the Xeno, or really paint it that much, and the tongue isn't actually mounted to anything, I just glued a Revo joint to it so it could hook over the lip of the chest. But unless the mou is flipped wide open, you'd never see that. Here's a pic from the sculpting of the gums I guess, it's the closest thing I have on my phone. The lines of teeth are attached with magnets
Here's the main stuff I used:
Covenant Xeno (neca)
http://www.bigbadtoystore.com/Product/VariationDetails/49863Treasure Chest:
https://www.amazon.com/dp/B00BS96DVW/ref=cm_sw_r_cp_apa_gbPQAbBQ2T2VC 