So, I know shaders don't work with the BOTI features. what I dont know is Why?

Is there anyway to make shaders work with the BOTI?

Does anyone know why they dont work?
Are there any shaders that do work with BOTI?

BOTI doesn't make sense to Shaders. Where is the TARDIS interior??How can it be bigger on the inside?  It doesn't follow basic geometry.