How to roll my own pypi?

Update: PyPi is now powered by Warehouse, which is the replacement for Cheese Shop.

The source to Cheese Shop can be downloaded from https://bitbucket.org/pypa/pypi/src. There is also an example, from the page you linked to, of using Apache as a "dumb" Python package repository:

# Mount pypi repositories into URI space
Alias /pypi   /var/pypi

# /pypi/dev: Redirect for unknown packages (fallback to pypi)
RewriteCond   /var/pypi/dev/$1 !-d
RewriteCond   /var/pypi/dev/$1 !-f
RewriteRule   ^/pypi/dev/([^/]+)/?$ http://pypi.python.org/pypi/$1/ [R,L]

RewriteCond   /var/pypi/dev/$1/$2 !-f
RewriteRule   ^/pypi/dev/([^/]+)/([^/]+)$ http://pypi.python.org/pypi/$1/$2 [R,L]

# /pypi/stable: Redirect for unknown packages (fallback to pypi)
RewriteCond   /var/pypi/stable/$1 !-d
RewriteCond   /var/pypi/stable/$1 !-f
RewriteRule   ^/pypi/stable/([^/]+)/?$ http://pypi.python.org/pypi/$1/ [R,L]

RewriteCond   /var/pypi/stable/$1/$2 !-f
RewriteRule   ^/pypi/stable/([^/]+)/([^/]+)$ http://pypi.python.org/pypi/$1/$2 [R,L]

Warehouse

Warehouse would be your best bet in 2017. From the project's README:

Warehouse is a next generation Python Package Repository designed to replace the legacy code base that currently powers PyPI

...

You can run Warehouse locally using docker and docker-compose. See Getting started in the documentation for instructions on how to set it up.

It is maintained by The Python Packaging Authority (PyPA) who work in cooperation with members of the Python core development team, and there is a live version running at https://pypi.org/ which mirrors everything in the legacy PyPI (https://pypi.python.org/).

For light-weight solution, use pypiserver.