So I bought this sleeper on Christmas eve for on my superliner, thought it looked like the ones on the liberty editions, but I see now they have 2 windows up top. Also, after further research (after I bought it of course) I see that a sleeper on a superliner from factory has the corners cut out for the exhaust. I think I have an idea for that when installed tho. My question is, how should I got about installing this? I didn't measure the opening on the sleeper, but it's more like our Kenworth with a flattop, not an upside down triangle like a Mack hole. Should I cut a square hole in the cab to match? Or "fill" the opening of the sleeper to a Mack style opening? Do I need to brace the cab after cutting it open or is it okay being an all steel cab? was planning on using that accordion tube as a gasket. Thanks for any help or advice in advance.