Ugh! I'm doing a version of this cake for my friend's September wedding! I (foolishly, lol) offered to make her wedding cake and then she goes and picks out something tricky!
I'm doing fondant over ganache, so I think my birch will be ok, but I'm super stressing out over the dang succulents and foliage. Maybe I'll surprise myself and it'll turn out fabulous! Yeah.
Well good luck! and PLEASE post pics when you're done!!