Hi Michael.
I personally think it's a great idea. If you'd like suggestions, take a look at apt-cacher-ng. It's basically an http proxy but specialised for Linux package management. Also, it works very well with other Linux distros. I believe the default settings have examples for gentoo, arch, ubuntu, debian and either msys or cygwin...or something like that anyway. I've used it with Linux mint without much drama.
Best of luck,
Alastair Knowles
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