Is being an retro fitter an actual job or trade or worth doing as a job?

I'm no reverse engineer but i can retro fit most things mechanical, i cant really explain what it is but i think some call it "bodging". Not only that i'm pretty good at graphic design and absract art as well i see things in my head no need for plans or drawings. All i know is i'm bored bored bored, i'm never challenged in work. I can weld bricklay fabricate do car mechanics do joinery and some plumbing and services (lay trenches for drains and sewers) use a lathe and any power tool you can think off and my day in day out job is to clean up after the trades on a building site and i'm a skilled labourer/chargehand. Any ideas what i could do instead? P:S i don't like working with other people, even though i'm a chargehand fully accredited i dont get paid enough to take the reins of telling the unskilled what to do and show them how to do it.