You must remember though that P81 had made models and textures for a different game, with a very different set of standards, and quite a few of his models that are still being used to some degree were made before BC was even created. Back then, any kind of map over 512x512 was considered very high res, and considered a drain on system resources, which would cause game lag.
I know there was a set of high res textures by P81 created, that had pretty decent quality, but I have no idea where they are, or who has them.