Sounds good - nice work. A little effort and you've saved one. Love the feeling and so often they're relatively straight forward fixes.

Are you sure it's yellowed and not just an early beige Mac Plus?

A retro-bright would give good results whatever the original colour was. A fresh "beige" Mac looks great, though I've still never done a retro-bright on any of my Macs yet...

Oh and because we all love pics - any chance of some?