Hello Steve
There is no problem you can post this photo (this is Jagpanther on this photos). About battery. My every model has baterry outside. I konw it looks not good but has one advantage. You wont dirt when tank is in mud.
Hey guys it my ideas but if you have concept about baterry and somoone else just write. Every ideas is good.
I'm not as good modeller as you so every improve is very desire.

Regards