That would require me to actual resprite and add in all the hud elements at a different size. As I've said already, the HUD won't actually fit in a 800x600 window at its current size.
The only text you really need to read is the scoreboard and the kill log. Everything else you can probably find based on its location (options, menu). HUD stuff you can probably figure out graphically.
I'll see if I can make the text bigger for certain things inclusive with the screen resize option, like the HP, secondary bar, scoreboard, and kill log.