a 7" lcd barely fits a 2-din hole. you'll need to do some bondo work on your panel to make it fit right.
a 6.5" lcd fits, but there are no available 6.5" vga touchscreen lcds. pioneer avic-d2 is an example of a 6.5" lcd using 2-din openings.
since you're on a 2000 civic, it's radio panel is similar to the newer civics. check out these finished projects:
2001 Honda Civic Sedan Carputer.
My 02 EP3 Civic install
99 Honda Civic Sedan Screen Install