Something like CQC sounds like it might be appropriate for your needs, though we'd need to work with you to add support for a few specific pieces of hardware (and we are happy to do that.) But CQC is a software based system and if you have have a PC network in place, you've already paid for a lot of the hardware infrastructure involved.
Anyway, it's an option to consider, and since you are specifically interested in a DIY solution, and are pretty technical, it sounds like it might to a good solution for you.
* I work for the company, so don't take my word for it. But look into it and see if it works for you.
Anyway, it's an option to consider, and since you are specifically interested in a DIY solution, and are pretty technical, it sounds like it might to a good solution for you.
* I work for the company, so don't take my word for it. But look into it and see if it works for you.