While I could technically get that setup working, it isnt something I would attempt to do. (either for myself or especially for others) There really isnt a lot of room in the Hudson boiler and the amount of time required to do a well-done retrofit of mounting and sealing smoke unit etc would be cost prohibitive from a time perspective. There is one aftermarket smoking whistle install that I have seen for O gauge was done so poorly it was no wonder the engine was sent to me because the engine stopped running. While there was no excuse for the poor workmanship I saw, it underscored the time involved in doing such an install. Also, given the number of things that could go wrong, it just isnt worth it in my opinion. .