"Now a Windows NT 4.0 UI clone."
KDE, set the menu system to the original cascading menu style. Use the Windows 9x application style and some of the various downloadable styles for GTK apps. Download Reactionary decorations. Job done plus the options for multiple workspaces and the like. I have a desktop appearance that's changed scarcely at all in the last couple of decades end then only subtly and mostly for the better (except where KDE managed to screw up, especially on auto-hide).