Hi.
May I first see and examine this one page?
I usually work with no frameworks (bootstrap, wordpress and etc) but with just pure HTML, CSS and javascript / jQuery. Being responsive usually means CSS work only but if it is necessary, we might need also to re-structure the HTML.
Kindly let me know.
Warm regards,
Hendra D.
N.B. - no worries about my first, requested milestone. I'm quite flexible with that.