The vertical can motors and electronics consume much of the space within the body of the MTH PCC so detailing the interior in the manner you describe would be difficult.
Corgi offered a model of the PCC which is truer to O scale and features a detailed interior. There are several motorizing options available for these cars. If you want a PCC with a detailed interior, the Corgi model may be a better option for you....of course you don't have Protosounds then.
Bob