I can help out on the editing. Select your object, go to the model room, select Edit>Convert to Other Modeler, and convert to vertex modeler. Your object will now be editable. As for the scaling, the only solution I can think of is to scale the model up (say 400%) after import, make the needed changes, then reduce the model back to the original size/scale (25%) before export. I'm sure someone else will have a better solution for scaling the model. Good luck!

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