If you feel so inclined to post it, I'd appreciate it. I was looking at doing the P42s and the new Renaissance coaches, but it looks like you had already done most of the work in this thread:viewtopic.php?t=26395
The MSTS2Locomotion conversion system does an OK job, but it's certainly not the level of what you're doing. Do you end up hand-editing the sprite images once they're converted out of MSTS, or do you start from scratch? I haven't seen a good discussion of the "cleanup" work to make a quality graphic.
There does seem to be a lot of work done and hard to find in the forums, not to mention unfinished packs and starting of another one and another and so on.... IA could be right about spring sequence although the problem seems so similiar to my first attempt I also could be correct.
My hand editing like others is trail and error as not all fields have been discovered as to what effects they have. Cleaning up sprite start before they are run thru MSTS2Loco for those that prefer shiney like new equipment. Debugging(cleanup) has been discussed in so many topics I would suggest go to 1st topic read each one all the way thru... get about 8 large cans of coffee if you plan on doing it all at on time
trail error and ask (after using search).