Ok so after a very long hiatus thanks to a new job and life I was finally able to sit down and work on this project. I have to pay for this hobby somehow! LOL.
After opening up the tender and looking at the existing electronics, there was very little room to work with thanks to the Vanderbilt tender. Interestingly enough the speaker is actually near the front of the tender facing upwards towards the coal load over a portion of the boards!
After removing the existing electronics and cleaning up some loose coal I was able to figure out how to insulate the boards and a configuration that would work in side the frame and shell. The new speaker barely fits into the “bracket” that the original one used due to the housing. This is what I have so far. Hopefully I can get back to work on it this weekend and do a final install.