The color mapping is based on Principal Component Analysis transformation. 

Experimental background modeling by 2D-spline optimization.

This is an HDR composition as usual with this target, to try to get all the way down to the core and reveal the Trapezium. 

Bortle 8-9 do not help even with (mild) narrowband filters. Fortunately this is an extremely bright object (for our standards anyway) so it came out nicely. As long as you don't dig too much in the background...

North is left.

Hα     : 20x600s, 18x120s, 10x60s
[O III]: 20x600s, 18x120s, 10x60s
[S II] : 23x600s, 18x120s, 10x60s