Modder Scaeling (formerly TheAggrivator) has just released version 1.0 of his Krystal over Fox mod. We posted about this as a work in progress a while back. Since then, Scaeling has switched from using the Adventures Krystal model to the Assault Krystal model. Scaeling says that college has been taking up much of his time, and though he wants to do a lot more with the mod, he wanted to release a working version 1.0 so that people can use it now. He notes numerous problems he couldn't fix in the time available, such as finger resolution and Fox's odd rigging proportions when applied to Krystal. Perhaps one day he'll be able to address these limitations.
You can download version 1.0 on the Project Release Page.
Thanks to TheAggrivator and Smokey for the heads up.