If you used the fenris wolf model as a base then the attach points will be in different positions than they are in the hoplite brgs.
The texture can be changed by using the replacetexture function in the anim text file using the name of the texture you want to replace followed by the new texture name. Plenty of examples of this in guides and in other anim files.
The texture can also be changed by hex editing the brg which there is a guide for by emjer in these forums.