Here some specific things that i'm having problem.
-I'm not using the elevator instances in some maps since they end/start in corridors.
-In the fist 2 maps i have a elevator, but like i said it's not a instance one so the default transition instance i couldn't manage to get working.
-I want to use the loading screens, not just a point_clientcommand with the "map" command 
If someone could give some help i would be really grateful 

with the modified transition script too, black screen and it spawn me in the same spot over and over, not the info player start though ( so i will try what you suggested when i get in home