To some extent, I have already done something similar to this but this was about 6 months ago. It will be worthwhile for you to continue as you probably have a better eye for what is 'mint'able and what is just ok. I just went for what was available disregarding quality. If you are interested in what I had, I could make that available to you. Like I said though, your process may be better.
Also, I think ThatMan84 uploaded all of the pointers in nearly complete set. I do not know about the rest but I think the ones I did would qualify as HD options. Then again, I am sure mine could be improved upon as well.
In line with the discussion and perhaps direction, would it be possible to make .psd files for all of the 3d artwork that we create. This would start a standard that could be used any time the xmls are updated.