Get yourself Microsoft Combat Flight Sim 3, you can fly the Horton. Northrop recently built a non flyable replica, it appeared on a television show about stealth technology. For you to build such an aircraft, you'd need hundreds of thousands of dollars (US) as well as a modern facility to build it in. Given it was never a successful aircraft, that is it never made it past its first couple of test flights, your gamble is great. Be prepared to spend millions getting the aerodynamic problems resolved.
Start with a Me163, that you can build in a shed. 