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I can relate totally to your delight (and frustrations!) Barry. The thing that really got me excited about imaging through my scope was the amount of faint detail that could suddenly be discerned. Its like suddenly having your own huge dob on hand, but as a bonus you get to keep a souvenier of your nights work too. If its a pretty pic you end up with that's nice too, but even faint glimses of the horsehead and galaxies from surburbia can be amazing.
M1 is one of those objects I always wanted to see with my old scope, but I now realise I didn't have a hope. You certainly seem to have captured the essence of the object and plenty of tantalising detail. 3min shots through a pollution filter with my Canon 450D struggled to show as much info as you have there.
If you want to be purist about the RGB you really need to identify a standard star in your image with known colour characteristics (with something like Maxim/The Sky). Might I humbly suggest you just get in there and have a go though? Although its tempting to try and get everything as perfect as possible, the reality of imaging is you're constantly learning new processing tricks so that you'll want to revisit old data and objects with what you've learned along the way. That's half the fun really. Plus the fact that one person's interpretation of an object is rarely the same as anothers.
Sorry if my post is a bit short on helpful tech detail. Hopefully the Gstar or RGB experts here will have help to give.
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