Well, if you like the whistle mechanism inside the SP caboose body, I'll save you some trouble.
- I placed 4 small squares of self-adhesive foam on the bottom of the whistle unit, to allow sufficient air flow to make the whistle sound.
- After repainting the caboose shell to look like a yard office, I took two scraps of wood, painted them grey like concrete, and placed them under the steps on each end of the caboose to raise the height... again for air flow for the whistle unit. Since the whistle assembly is black, it's not all that noticeable.
- I used plastic from a milk container to make window glazing, but only for the visible front side of the caboose shell. I left the back and side windows clear, again for air flow to the whistle mechanism.
You can do your own experimenting, but as with your above tender project, the air whistles - with their pleasing nostalgic sound - still need sufficient air flow.
