Transistors? It's a Digital Logic Simulator. There is no elecricity. Doesn't an AND Gate already act like a transistor or what should the transtor be able to do? Your idea sounds very interesting, but don't understand it. Please explain more precisely what you want the transistor to do.
There are two types of transistors: NPN and PNP. NPN is look like And gate but they aren't the same thing. The transistor is more like 3-state buffers but also they aren't same. Because they have common things but you have to add a resistor. So differents between 3-state buffers and transistors are one of it is a logical thing and other one is a real component and some technical things (voltage and other things). But for PNP it's a PNP transistor and not gate but also they aren't same thing with NAND gate.