Thanks for all the responses! She will be happy when she reads this.
I'll try to address everything.
A general thing is.. This cube might even be smaller than you guys think :P.
Another general thing, the two mountain like things are chunks of wood, not rock!
Stan. I like your thought.
I'll try rearranging some stuff. I have some more pebbles. I'll put some mini pellia on them.
This tank will have mini Xmas, mini pellia and fissidens.
I don't think I will have room to drape anything down, but floaters? Sign me up! I'd like to try some red root floaters.
There's no water in the tank yet, but I will say it has to be mobile, as it may be moving once or twice a year.
And by mobile, I mean a little movement won't hurt the scape. That's why I tried to do a secure scape.