Partial Success.
Have managed to import an SH4 ship with a texture. Still doesn't look right though.
Should look like this
It looks like the Tex is there, but I think it is missing the bump and occlusion maps, which is why it looks a bit odd.
This was the next problem I was going to try and solve when my connection failed.
As far as I can tell SH5 ignores the map assignments in the roster cfg.
So I embedded the Tex file in the DAT file.
See pics of my DAT as it stands at the moment.
The question mark in the first pic are setting that I don't really understand fully, but I was playing around with in order to improve the image.
Next step for me, try and get the bump and occlusion maps into the DAT in a way that works.
I tried this a few days ago but could not figure it out.
I'll try and get my head around it tomorrow.
EDIT: Please understand that I have no prior experience of messing around in the ship DAT files, so I am pretty much guessing everything at the moment. Just turning options on and off, adjusting numbers etc. then going into the game and seeing what happens. It is a slow but educational experience!