Yeah the GMM kit is for the RR/MP Bay Winder Cabeese. The caboose ends from MTL are incorrect for a LL NE Caboose. I've "had-it" trying to find parts to rebuild them, not to mention the pain in shaving all the details off. I can get good results but I have no wish to be a micro-surgeon.
It would've been nice to see Atlas make one, or some updated tooling from Walthers. For now I'll settle on finding OMI brass, or someone to make a kit or detail set (come on Bob!).
The S.