I recently got two similar jobs of porting a responsive website from one framework to another ie Zurb Foundation to Bootstap and Gumby Framework to Zurb/Bootstrap. Do I have to personally go through the various nitty gritties, functions and all or is there any other way. Also aren't these three frameworks connected, functions and all similar. (I've heard that Gumby's basically a fork of Zurb Foundation) How much work do you think i'll have to do, I'am relatively new to responsive design and this isn't one of my highest paying projects! :D
Just replace the CSS/JS files and then do a find/replace in all of your HTML files to swap in the correct classes. For instance, if you were going from Bootstrap to Foundation you would have to change all instances of col-sm-12 to small-12 columns.