Low bandwidth/limited time online installation?

Hi,

I'd like to install gentoo 1.4_rc1. I have downloaded the approriate stage 3 
install package and burned it to a CD as required but I have a problem that I 
need to solve...

My internet connection is over a 56K modem and my ISP limits me to a maximum 
120 minutes of dial-up time before they hang-up on me without warning :-(  
Obviously getting a full install with KDE or Gnome and the full 'bag of 
tricks' is probably going to take a while longer than this over a modem.  Is 
there any way around this?

I do have a 512Kb connection at work, is it possible to download and burn a 
batch of CD's with the sources I want and then tell portage to use the CD's 
rather than the source servers for the install? - before anyone suggests it 
I'm not allowed to take my tower to work and plug it in there ;-)

Thanks in advance,

Matt.