Depending on how big a gap it is, I've used either superglue with baking powder to fill in smaller gaps, then sand to finish. Otherwise milliput, or green stuff will work as well. It will take some work no matter what you use.
Another option is to make battle damage in those areas, if you are wanted to have a worn out look to them when you complete the model. Depending on where on the model it is, could have a hole down along the side/front or back, and it angles up/down to make it look like it was a shot that went through the rhino.
Just some ideas, hope that helps.
DK
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