if you only change the condensed font with fonthack no menus or other things are changed in the gui.
So change condensed to your favorite font (I am doing the same).
- Monospace is a font where the "i" letter is as wide as the "W" letter e.g. Courier font.
- bold is not a font it is a font variant, so switching is not so easy. you have to modify the book source
- read above