Hi. I had basically the same experience. I had the demo which I played quite a lot which came on Turok 2 CD. I liked the machine designs, their voices and colorful graphics. It is one of the first games I installed myself and first RTS game I ever played. I downloaded the full version from the old forums in 2008, but I actually have not finished it until 2 years ago. It is a very hard game and I probably would not be able to finish it if I played when I was a kid.
There is not much activity here, but you can check out the discord community. I'm not a fan of it, but unfortunately forums are not popular these days.
Here's a post where I'll place resources from the past two projects we worked on.
List of Machines: List of Machines.xlsx
OpenMachines Repository (SpringRTS Version): https://sourceforge.net/projects/openmachines/
Machines Legacy Repository (Unreal 4 Version): https://github.com/OpenMachines/machines