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Hi Peter,
Your steps 1 to 4 will work fine. For the Trius with Sony sensor just subtracting the bias is a good option. I'd be inclined to build a bad pixel map but the process for doing so in CCDStack is a little convoluted. I ended up have to script mine to get the best result. Other apps such as MaximDL, PI, etc are more intuitive with bad pixel maps.
With regards to flat subtraction. Only need to subtract the bias assuming your flat sub exposures are relatively short. Say under 30 seconds or so. Being so short, a bias master is a better match. If you've got some very long flat subs, you may want to consider dark subtraction.
Just remember to not subtract the bias from the flat twice per the attached.
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