I'm modifying an old organiser box to use for storing and transporting my Epic ships, and it's just occurred to me that I should probably leave some space for the Raider when it finally arrives.

Only thing is I don't know the dimensions - in particular the height - of the model.

The only source I can find is from BGG which states 5.5 inches (135mm) - this sounds more like it's the dimensions of the box rather than the height of the model as most photos of the Raider next to the Corvette seem to show similar height for the 2 models - and the Vette is only about 2 3/4 inches (70mm) at it's highest point.

Does anyone have any more detailed info?

No one does. In universe the ship is the same length as the corvette, so most are assuming the model will be the same length but we just don't know.

I do think someone did some extrapolations based on the idea that it was the same length, but it don't know what he came up with, and it would just be an educated guess anyway.