- Did you glue it up ??
- Are you blasting it yourself in-house ??
- Is it double-sided ??
- Is there a contour shape to it ??
- Is it V/G clear heart ?? Yes, cedar can have this, too.
After calculating these costs, add in your time and materials along with all of your overhead and incidentals, then add in your markup and profit.
Per square foot is a dangerous way to do one of these. Unless you are doing them quite regularly.