Well, that's kinda what I'm doing; my plan is to make it all one compartment as a 'Directors Saloon', with a table and multiple armchairs inside it. It's also most likely going to be the oldest 'passenger coach' on the line (which depending on whom you ask, is either known as the "Yarlshaven Light Railway", or the "Jarlshaven Light Tramway"), though strictly speaking it's probably more like Departmental stock?