What Moleman said. Back when Gunco got started the kit building community was fairly small and there wasn't a lot of info out there. Most of us were "making it up as went along" and posted what we found worked, and just as important, what didn't. AFAIk the first practical AK flat bending jig was created by a member here, and he very generously shared it with all of us. A search of the older posts will reveal all manner of build info for AKs and other guns. Tooling too, a large percentage of the commercially available tools today started out as someone posting a photo of some scrap metal they had ground and welded into a tool of some sort.
As more folks discovered kit building could yield an affordable gun from "scrap metal", the community grew and Gunco was pretty active for a while. Especially when the process to do so had become known from trial and a lot of errors! As a famous German once said: "Some people learn from their mistakes. I prefer to learn from the mistakes of others".
But times change, and the lack of available parts kits along with increasing costs have curtailed some parts of the hobby. Today most folks who "roll their own" are putting together AR15s and Glock clones from DIY kits. Not much info is needed there beyond the instructions on the maker's website, plus tons of YouTube vids detailing things. This was always mainly a build devoted site, and a lot of the "political discussion participants" left for their own forum long ago. Plus us old timers are just that, old. Many are no longer with us, sadly. Over the years the folks who visited regularly have dwindled.
I'm also a member at the AKfiles and Weaponsguild, two more build oriented sites. Weaponsguild is still a mainly builder's site, but more for the hardcore crank up the mill and lathe and give me that piece of steel bar, "I'm fixin' to make a gun" types. AKFiles has very few build threads active, but has a very robust marketplace and is full of general and political discussions. It too has a vast array of knowledge to pass on, mainly in the older posts just like Gunco.