Looking really good to me
In regards to cavalry, the horse models we use are not vanilla, so if the horse model in the render is vanilla then that's where the issue is stemming from.
Idk if it mentions in the tutorial, but to figure out the mount, you have to look at the mount line in the EDU. Then search that in the DMB. All of our horse models/textures are in RTR/data/models_unit
Hope that helps.