This mod is the one I use to test improvements. I have a draft tutorial on how to make them and I use this mod to test the graphics.
I recommend if you already have a gr2 done then either rename it to WTI_HB.gr2 and write over the one I'm using (back it up of course) or just edit the WTI_HB.fxsxml to reference your gr2 (but also add your gr2 to the modinfo file).
You also have to add your textures to the modinfo file either way.
I include my blend file for the tiles I do. you just need to rig it to the same Point01 bone as the holysite.
civ5 Improvement Test Mod 2016-10-05
civ5 Improvement Test Mod