First problem is that SH3 originally was made for 1024x768 screens, a aspect ratio=1.333. and 1920x1080 is a ratio = 1.777.
You could play direct on the big screen but with a distorted horizontal view.
The auto screen adjuster mod still will not work here as the SH3 interface images are made to 1.333.
You.. either have to use the MacGui Widesreen mod, or make your own interface pictures to the 1.777 ratio. There would also have to be a few co-ordinate changes in the control files.
So MacGui Widescreen mod seems to be the way - I'm not sure whether other mods are available.