One of the coolest things I've ever done is open a retail store. The smartest thing I've done is close that store. Don't do it if you want my advice.

If you want to do something related to the hobby use your skill with acrylic and go that route. You could work a regular job day time and spend your nights and weekends building sumps etc. until if/when you get that profitable. You would be working all the time but at least you would have income. With a retail store you will also work all the time but without the income. Generally it takes ~2 years for a retail store to get into the black...if things go well that is.