Salt et al: If you bought the $500 tier I'll be handling you one-on-one via email or chat. I think you've provided some good info on your weapon and dude, so we're pretty clear there. I can message you when I start working on it (could be a few months).
The skills are:
Construction,
Growing,
Research,
Mining,
Shooting,
HandToHand,
Social,
Cooking, - Cooks tastier meals, doesn't set the kitchen on fire
Medicine, - Can do medical operations, and do them better. Some operations will have minimum skills, and risks of critical failure
Artistic, - For painting, engraving, sculpting
Crafting - For manufacturing items like guns and tools and perhaps furniture.