Hi wcbenyip,
Mega menu is tightly integrated within the T3 Framework and is not available as a standalone module / extension. Since, mega menu is released as GPL with The T3 framework, you can use the files from it for your project. However, you will need to maintain the file copyrights and license info.
At the same time, you wont be able to move any graphical element (css code / images) from any of our commercial templates (club templates) to Non-JA template.
So you can use the T3 blank or JA Purity II styles for your non-JA template while retaining the credits in the file header for the same. i am afraid we wont be able to provide you with support for this customization.
Regards
Arvind