Is this the same size as the filming model?

How many polygons does this have? Can you please convert this into a fbx file? Thanks!

odd cause i used the same panel lines as the original one

Looks very good! Which reference did you use? I compared the renderings with some of my books (Sculpting a Galaxy and Star Wars Chronicles) and they look very close to the movie prop. Only the forward section has a different panel layout at the sides - why? Everything else including the greeblies are a very good match.