I use the interior from the NKP Berkshire/C&O Kanawha, as it has a cutoff wheel as 2816 does, where as Bigsteam has a power reverse lever. I guess Auran just didn't do their research to find that American engines don't have cutoffs, because I have seen the cab of 2716, 1225, 765, and another Kanawha and they all have power reverse levers, but for 2816 the cab works great as it has green walls like 2816, a cutoff wheel like 2816, vertical throttle, etc. So for any one with that PAYWARE addon you should change it afterwards. misterb11 will not be able to release it with that, but he could put Bigsteam, add a read me file in the folder that suggests you change it to the Berkshire interior for a more realistic experience, and have the kuid to copy and paste into the config listed there.
Saturnr