After some deliberate discussion with the "concerned experts", i might be going for one extended door instead of two small ones. Here are some of the options. Pls suggest which one looks good.
Option 1. Just the extension with no roof cage.

Option 2. High roof at the back with NO roof cage.

Option 3. High roof at the back with with a flat roof cage on it.

Option 4. High roof at back and a roof cage on the front top of the veh.