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the artwork is just someone going through all the Uop files running a program to increase resolution/edge smoothing and then touching them up some by hand.
There are 2 actively developed Classic Clients out there (open source) on sites that shall not be named. Increased FPS and screen sizing, by dragging a corner and pull to the length you want, screen zooming (in and out) all added. Plenty of YouTube videos out there. The ability is there but don't expect this team to dig that deep into it. While the new content is great unless the client gets an overhaul it is still the ship that will not sink, but is sinking none the less.
The ability to increase screen size already existscheck under display https://uo.com/wiki/ultima-online-wiki/technical/classic-client-user-guide/classic-client-options-menu/