Last night I managed to get 6*20mins of OIII and 4*20Min of SII of the Eastern veil tail and crudely mashed them together I am pretty pleased to see the colour result. The SII has come out far better than expected with a good amount of definition.
For the bi-colour combination SII has been assigned to the Red Channel and the OIII assigned to both Green and Blue channels. This creates a pretty close representation of the natural colour as the OIII band is a teal colour sitting in between Green and Blue in the spectrum.
Should be even better when processed properly.