Making dreams come true when you are in the depths of life; good paying job with benefits, mortgage, bills, and so many more things, is not going to be easy. I've never said making dreams come true is easy, I said it's possible.
Dave, you have a good job that provides for your family. You know that it's not beneficial for you to quit a full time job to move across the country to take a seasonal job. My thoughts are that you plan for the worst - plan to stay in your current position until which time you can retire with your full benefit and then relocate to Gettysburg, PA to work part-time. Sounds a bit like telling a ten year old that they will be eighteen in the blink of an eye, doesn't it? The reality is that you are ten years away from full retirement, but if you are enjoying the journey through those years and implementing some of the little ways to live your dream now, how bad can that be?
Stay firm and hold onto your dream. It's not a matter of if you will be a ranger in Gettysburg, it's a matter of when. And for the record, I'm with you all the way and we will see this dream through - big bucks or not!