yeah, I do think I'll alter the rules about the Diorite today. What you've done there is an excellent example of what would be allowed and shows why it should be allowed. The platform is still instantly recognizable but it compliments your build now in a way that the generic starter one would not.
Its been a while since I played Minecraft, in fact I had to buy a new account since I forgot the old one hehe. Here is one of my buildings for the Medieval Pack in building :)