It seems like lots of forums got more quiet in the last years.. Lots of people say the action is now mostly on facebook groups.
But also I personally have not worked on large scale builds in the last few years, I still have the large Subaru Impreza build on standby, have not touched it in forever. I have been doing custom smaller scale, 1/10 mostly (a custom rwd escort mk2).
I have been mostly around scale4x4rc or scalebuildersguild recently. Smaller scale is easier to scratch build in some aspects, parts dont need to be as strong and materials easier to cut etc.