MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
The doors are printed as one with the body and are not attached on the sides, only the hinges, so filling the gaps will probably work well for you. The filler work great on big open areas, like the roof, not so much on a detailed parts of Annie and Clarabel, so I suggest you ignore Tamiya Putty, It hardens to fast and to much making it very time consuming to work with. I do not have any experience with XTC-3D or similar, so I cannot give you any input on that