cutting glass on 54 chevy

I tried the search function and did not find what i was looking for ( before you ask).I am chopping a 54 chevy and I know that there is a guy here who can do the front but it is my understanding that the rear is tempered and cannot be cut.Is this true?. If it is true,what are the guys doing that are cutting down the back glass because i have seen a bunch of pics online of cars with cutdown back glass.Are they in fact cutting down the back glass.If so,who is doing this ( name,number), or are they having new glass made ( who,where,name,number).I have also heard of sinking it into the rear deck.I have looked and I really don't understand how this is acheived.Does anyone have any good pics and details about how to do this.I know how I want to do it, but if I cannot cut the rear glass or get a new one the kind of screws up my plan.I appreciate any help you guys can give me here.

Thanks
Ben
hotrodk5@hotmail.com

 

I dont know who can do it, but they are making new safety rear glass that can be cut.. and some people use lexan.. like me i made my back window fram wider and had to go with lexan.. and i regret it now

 

Who makes the lexan windows and why do you regret it.Thanks for the reply.

Ben