>>I got it unioned but now the surfaces are broken and I can look inside ...<<
I dont quite understand.
Are you saying you have attempted to boolean union the "Triangle" to the other main part, and that then tears/breaks the model? If yes, then remove all the faces that are touching for the union, then use join. (if you have a fairly complex shape (such as the triangle) then attempting to union, the coincident faces causes problems).
Re-post the model if I have not understood the problem.
- Steve
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