I know I'm a bit late to jump in here. I grew up at the base of Welsh Mountain and I can tell you that trespassing and asking for forgiveness is not a good idea. The people up there are good people but they have a history of handling things their own way, and people have "disappeared" up there. A few things to consider before the trek;
1. There are descendants from the Buzzard Gang still living there and they are sensitive in regards to their history.
2. Most of the families there come from generations of poverty. Many of these families lived in shacks and shanties, most had outhouses into the 70's and 80's.
3. Members of the Pagan Motorcycle club reside there.
Again, mostly, these are friendly people. If you drive through you will see some nice housing and some poor housing. Some of the folks will wave as you pass, some won't. But most prefer privacy and will defend it. I've seen it and wanted to offer warning; get permission. I am most interested in the history of this mountain and have considered a trek myself, but not onto private property. That's a game of Russian Roulette up there.