There are model units posted on this link:
http://nagccurriculumnetwork.weebly.com/award-winning-units.html
NAGC e-book on ideal curriculum development for GT learners:
https://www.amazon.com/Engaging-Challenging-Curriculum-Supporting-Advanced/dp/0996086692/

I know you were looking for something other than the NAGC standards, but this is the research basis of the standards.

William & Mary curriculum:
http://education.wm.edu/centers/cfge/curriculum/index.php

UConn Renzulli Center curriculum links:
http://gifted.uconn.edu/projectm3/m3_about_curriculum/

These are pretty much all project-based or integrated/thematic curriculum modules.

...pronounced like the long vowel and first letter of the alphabet...