Thanks. Thought I was being too optimistic
I've managed to get 1024x768 working using the vmware drivers. Basically I did the "kdmconfig" command and chose "Xsun" and not "Xorg". At least I managed to get a display. With Xorg it just fell over in a heap.
The resulting display is poor compared to my underlying system (Redhat FC3, AMD 64 3500+ CPU & Nividia Geforce6 6800GT card). But it's perfectly OK for what I want to do.