After commercial cutting for 5+ years I just use a square foot charge. I found when I tried to make it complex with art fees and stuff they just walked out the door. I have a price per sq ft (nearest sq ft increment) for unfinished (like it comes off the table), customer provides the material, and for paint ready (de-slagged and mill scale removed). Our base price is for 11 ga and goes up with thicker material (unless customer furnishes the piece). I don't encourage the one-bracket-cut-while-you-wait business. It's real hard to make money doing that kind of work.
The problem with charging by the hour is the customer does not relate a job to time and they want an instant bid. If you have to take time and do a quote only to have them say "I'll get back with you later" then it's just wasted time.
If you can do the bid in your head based on size and material you can find out real fast if they are tire-kickers or real customers.
TOM CAUDLE
www.CandCNC.com