I decided that I would use the router to shape this. The dust collection on our Techno is pretty good, and I could do something else while it was working.
The good thing about using our Techno cnc to shape this, is that it will be exactly as I drew it in the computer. There isn't alot of room on the sign box, and I didn't want to run the risk of the dimensional water impeding on the text portion of the sign.
I also quickly massed up one of the rock sections. This I will sculpt by hand. There's not alot of depth at the top of the sign. The building we are in has block walls that run about 4" past the top of the sign box, then it becomes corrugated steel siding, which sits proud of the blocks by 2". This reduces our depth where the rocks live, so they're getting a little shallow. I will have to work very closely with the seagulls when I start shaping the rock, just to be sure everything works.