Good luck. If you pay yourself $0.01/hr you might make a profit.
I read an interview of Andy Mathews and the time he spent on these models was enormous and to sell it at $20,000 was not even breaking even.
It's more about an obsession to his art than making a profit.
I remember reading about a guy that had a dream to own a Ferrari so over 20+ years he made his own fully working Ferrari. At the time I calculated that if he spent that time working at $7 per hour he would have been able to buy a new Ferrari instead of making his 10th scale working(engine and all) replica.