To keep it as close to original as possible, I'd suggest banning things that came with the expansion packs, like clubs and tiny lots (and probably more...) Banning new stuff doesn't look like rule changing to me - it's, on the contrary, making it look more like the original. Otherwise, the gameplay is too easy with all that new stuff. And, in my humble opinion, even given the fact that this particular challenge has a huge reason to have certain rules - it still shouldn't be too easy. It's a major, after all.