Setup local builds

We are looking into running some (if not all) of our builds locally, since we have some nice hardware which would otherwise just be standing around.
In the documentation I read that we are then responsible for setting up the environment and versions of all tools ourselves. I was wondering if instead it would be possible to use the images you guys are using?

I understand that we might have to tweak them a little bit ourselves (specifically in the caching), but it would be nice to have a baseline that is the same as what is used when running on your infrastructure.
So, are the images available, or could they be made available, for download and usage for on-premise builds?