Thank you John! I have a lot of floppy disks, just must to remove the dust. I will try with these disks and see how it looks like.I just discovered this thread so sorry for the late reply.
The best method I have used to imitate glass on ships is the disc of the old floppy discs.
It is highly reflective and dark and looks good at the smaller scale.
These days they're getting harder to find (unless you kept a few from the 'olden days')
I have to agree with Joe on the lack of quality of glass in these times.the glass was blown glass which meant it had inclusions such as air bubbles and waves which also meant it wasn't very clear like we have today.