DiecastXchange mate

Massive International forum that caters for every taste, very friendly atmosphere and some amazing custom stuff on there, plus a wealth of collectors knowledge.

MM is also ok, but more UK based and definitely more Ford flavour there, if that's what you are after.

Customdiecast.proboards.com is another that I visit.

But to be honest, I find Facebook to be the best place for discussion now. Loads of community pages on there.

This is just one, but you can gather more from there.

https://www.facebook.com/groups/339312682872021/