File structure for custom modules in Drupal 7

Question

Note: I have already posted this question on [SE's drupal] but didnt got any positive response there so i am posting same question here again.

---

I want to organize non-core (modules that are not bundled with core) modules in Drupal 7. This is my proposed structure:

1. Contributed modules - downloaded modules that are untouched
2. Custom modules - downloaded modules that are modified to suit the requirement
3. local modules - self-developed modules

I GUESS, the best approach for this is to make three folders within sites/all/modules like below:

1. sites/all/modules/contrib
2. sites/all/modules/custom
3. sites/all/modules/local

Now, there are two ways to install a module:

1. Manually
2. From the admin panel

While installing the new module manually, everything is fine. I can just go to the directory and place the module there. But how to install a newly downloaded module in `sites/all/modules/contrib from admin-panel. Moreover, is there any better approach for organizing non-core modules?

Answer 1

Finally after banging head on google for hours, asking question on SO and SE's drupal and communicating with other users via comments, I cracked it...

Well, the directory structure is still debatable but satisfactory for me. But the answer to the most imp question is "DRUSH" .

Refer this and this node from Drupal. Collectively, it has everything needed to answer my entire question.

I would also like to point you to this answer which has provided the first and most-imp hint to me.