You are doing great!
One reminder: Pepakura can only be used for unfolding, not for 3D modeling. What you have done here cannot be done with Pepakura. It can only unfold parts and add flaps. It cannot change geometry.
This is a GREAT companion piece to the PaperJuke T-Rex. Absolutely fantastic! I love it!!!
I'm sure a lot of people would like it. Could you upload the Spino to the Resources, please?