Only a couple of yrs back from your good self so I understand where your coming from with a change of work at this time in life. I had a similar dilemma 3-4 yrs back as i could not see a ongoing future earning a living from metalwork and not wishing to give up working for myself. Stacking shelves in a shop did not appeal to me !
Farming /Timber, horticulture and metalwork background with all that brings caused one of those... "Lightbulb " moments in the wee small hrs.....saws..mowers..trimmers....!!! Have workshop.....have some knowledge .....have tools . ....now all i need is to get folks who need repairs and servicing doing to use me rather than going to the main dealers at £60-70 a hr. Still building the contacts and the service book up, but things are getting there.
The ideas are flowing already by the sound of it...Gun smithing..Well for sure you have guns in the US
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'Lightbulb " moments do happen