Your CV/Resume is a crucial part of your HBS 2+2 application -- same goes for any other deferred admission application for top business schools. One of the things I work on most with 2+2 applicants is developing the professional experience section: while you're not expected to have extensive business experience given your status as a full-time student, we do like to use treat the internships seriously, as a way to demonstrate the abilities and exposure you've been acquiring. But balance is also very important to b-school-application resumes: we give a lot of space to community involvement, campus leadership, areas where you start showing the "habit of leadership" Harvard is looking for. These would be less prominent in a professional, post-MBA resume. So bear that in mind when using the HBS-style resume templates you can find online.

Many professional admissions consulting companies, such as Stacy Blackman Consulting, will offer resume reviews and editing on an hourly basis, which you might find helpful.
Good luck!
Margaret Strother