In order to recycle the Minotaur meshes in Alex's add-on, you'd need to (somehow) contact him to get his permission to repackage them with your additions. Another solution would be to grab a copy of anim8tor or Blender and re-do the rocket with your own meshs.
I could probably knock something moderately acceptable, but even then you'd have to credit me for the work. Textures I'm not great at, but like I said, I can make something workable.
What is the problem with the fairing being in 2 meshes? Multistage2 should take it fine, so long as theyare named properly.