Dan - as a sidebar - I've also read that as long as you have your system unit scale set to 1.0=meter, it doesn't matter whether your units setup is metric, or English....?
(just curious - haven't gotten to that chapter yet)
[quote]firstly, you want to customize it in the first way so..
click
Customize> units setup> metric> and change it to meters .
Next, because gcraps is naff in the head, click...
Customize> preferences> then at the top, where you see 'system unit scale', change it to 1.0 = meterBingo

Might need to resize your model now mind you.