Actually, Mick, from what I remember of a trip aboard Waverley she has a small porthole either side in the engine room behind her paddles.... Â
By the way, one of the best views I remember from Waverley under full steam was obtained by sticking your head outside the starboard male head (washroom) porthole!...
Yes, waverley does have those portholes, very useful for looking at the construction of the wheel, I don't know if all paddlers had them...
...I have photos taken by holding the camera at arms length out of the washroom porthole, the result is spectacular

It's not possible now to stick ones head out as there are steel bars fitted to prevent it!