Why bothering going all the way to Mojave?
there's an old 727 ex. Allegro. You just go to the terminal, ask for the administrator or someone that could help you buying that 727.
At CVJ there are 7 ex. Aerolineas Internacionales 727s. I've heard a week ago that they'll come back with 2 and probably they'll add 2 more. But I know that at least 2 won't get back to the air. You could also go and search for those 727s.
At TLC airport you have 2 ex. 727s from Taesa.
At MEx you have 2 ex. 727s from Taesa. (In fact there were 4, one has been cutted in piece going somewhere and one its a 727-100 that will carry Mexicana's colors at Museo Explora in León city)
And at MTY
there are several ex. 727s from Aviacsa/AeroExo.
In Costa Rica I think there are several 732s ex. TACA.... closer to CUN
If you still want to go up north, please bring a 747! I would love to go to your restaurant! It's a very nice idea.