Magnetising Stonehorn/Thundertusk

I got this beast of a kit just yesterday and I knew it in my heart that I had to built it ASAP. Problem is, I am still not sure which is better for my Ogre army yet, the Stonehorn or the Thundertusk. Well, why do I even have to choose between the two? Why can't I have both? Fortunately with a few magnets, green stuff, super glue and a little bit of magic you too could have the best of both worlds!

The two main differences between the beasties are their heads and backs. After assembling the main body, I assembled the two heads separately and also left the big piece on the back unglued. Every time I had to install a magnet I started with a small guiding hole with my pin drill. Then a larger hole with a larger drill. After that I took my trusty Dremmel with the grinding stone tip and enlarged the hole enough so it could fit the magnet. I covered the magnet in green stuff and shoved it in the hole and also added some super glue on top for good measure. This is the torso:

Not the neatest thing in the world but no one needs to see it.

Stonehorn head.

Thundertask Head. Also had to trim it a bit to fit properly.

I couldn't glue a magnet directly inside the back of the beast so I used a piece of sprue that could hold the magnet near the top. 

Also I had to use some green stuff to elevate the magnet a bit from the other side of the back in order for the two magnets to be close enough together and stay in place.

So, after all this hard work I can now assemble the Thundertusk as well:

Voila!

Had to compromise in a few things though. I have to use Stonehorns tail for the both models, the other one  is just too stumpy. And also I couldn't use the magnificent saddle for the Stonehorn since then the rider on the back wouldn't fit in the Thundertusk. Ah, well, I can't have everything. There are also a lot of wonderful bits (shoulder plates, skinned poultry, severed hands) that I will glue on the model after painting it (they are just going to be in the way now). 

I just don't know how to paint it though. Should I go for a white, dark brown or reddish (Vering) brown colour scheme? Suggestions in the comments would really help. Thanks!