The GetStringRes bit is because the RSR in not just the binary verion of the obj, as it often claimed. It is that, but it also seems to have a bunch of embedded data produced by poser processing the obj and the CR2/PHI. That is why, if you reimport a .phi, you will not see any changes if you do not delete the existing RSR first. (at least in 3.01) When you hand edit a cr2 you are not generally making horribly drastic changes, like changing the orientation of all the joints. Meta uses codewarrior to produce their cross platform code and Larry said that the calls to the resource fork (the GetStringRes) are produced automatically by Meta's tools. They are just labels, as far as I can tell. The main limit you may run into is that future versions of poser may do stuff with sections that now seem dead. Some parts of the CR2 are basically there for backwards compatibility. If a new version needs something that you have decided isn't important you are going to have to fix it. For a prop, that isn't going to be too bad. For a complete figure that could mean a whole lot of work. I don't think it's worth the possible problems. It takes something like 3-400 figures to use a GB of disk space. But it's up to you.