Well the Teleporter could be made invisible in older versions, but I removed it. I never saw a Builder who build really "good" things with invis Teleporters... If you want something suprising, use an invisible executer.
No it will only be the model. That map is also shared open source and so everyone could easly hack his score. But if you only gain higher ranks and models, its not really worth to hack the code... I also wanted to make EB more newbie friendly. How should a newbie be as good as someone who loads an lvl 20 Escaper? The Builder couldnt even build a balanced escape for them both.