I think the U.S.S Voyager model had little images inserted into it to mimic interior sets on some of the larger windows that it had so that early on you could 'see' inside the ship as the model flew past.
I do remember that VOY ep where they started at the front of the ship and went through it and then did the pull out at the back of the ship. Think it was a sixth season episode somewhere.
I still think it's also 'meant' to be trees that you see in the big blue windows on the bottom of the secondary hull on the U.S.S Enterprise model in TMP in the final shot before she goes to Warp, as I think that was meant to be the arboretum (did I spell that right?.............)
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist