Over the last few days, I've been working on the improved floor builder for the upcoming Beta 1 update, and in just the last few hours, I've implemented the custom texture support for chunks shown previously in a test project into the main project for BFNSU, albeit with some improvements and changes (such as the ability to have a different texture for each wall of a chunk, rather than all walls of a chunk using the same texture which is how it was done in earlier versions). I've included some WIP development images of this feature below, and you might also notice that some of the custom textures in the first image are from another project I've created in the past...
<-and pls use dis