As a comparison....
To remove my front bumper, fully strip it of paint back to the fibreglass, re-glass the whole surface, and strenghten the edges in the design, then to fully repaint in a Pearlescent paint, and refit...
.....£600
That was at Lee's bro's place - Falcon Performance.
I know it doesnt include bonnet, but seems like alot more work involved that what they are quoting you for.