FWIW, the original 150, from 1959-63, was about 1,000 lbs empty, with 1500 gross. Adding the rear window in 1964 added 100 lbs to empty and gross, which didn't change with the new shark tail in 1966. It also got about 10-12 mph slower with the back window. Going from 100 hp Continental in the 150 to 115 hp in the 152 was needed for the extra weight of engine and airframe. It gained higher TBO engine, and higher fuel consumption, at no real increase in performance. I never noticed the 152 was wider.
If you're a big student, get a small instructor. It's a better chance she'll be easier on the eyes, too.
GB