How to make this model bigger?

I've been wanting a MG 42 a long time.
Recently I downloaded this p model from a German site,
and what a big disappointment I get :(
I think the creator purposely did this so that the model can pass the file
consistency check. Make sense didn't it?
Model scaled, but messed up...

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I scaled the model to 1:8. But... It's floating in the air... |
Model fixed, but can be done better

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Model was fixed. But not 100%.
Special thanks to m1st3r-X |
A close-up view

Go here to download the corrected p model.