I haven't looked at your own installer (I've been meaning to). But the one issue I have with it is about the compression. When compiling the Python distribution, zlib is not standard. This means that pyz files aren't altogether portable.
BTW, what again is the URL of your installer? I have my own that I had written (spamcan) and wanted to compare it.
zlib is standard on Windows and comes in the RH RPMs. That's close enough for me <wink>.
It's on the contrib site under System, but that's in the Windows-only form (an exe). It will soon have a homepage on starship. I'll again offer the inner pieces as tar.gz, but when I did that before (on my now defunct corporate site) I didn't get any takers.
[BTW, I'm not on this SIG, I just check it periodically].