Instead of writing a script to install seperate packages, why not burn a new CD with the updated files?
Here's how:
1 - copy the 3.9 Cd to somewhere on your HD
2 - extract and merge the BB1 and BB2 files
3 - copy these to (Copy of CD)/OS-Version3.9/Workbench3.9
4 - delete the audio and video files to make space for your own additions
5 - delete help/locale/keyboard files for any languages you don't need/understand
6 - replace the icons if you want (ie. from GlowIcons Collection CD)
7 - update the contributions
8 - replace AWeb and Genesis with MiamiDX and iBrowse
9 - modify the installer script (might be tricky for some)
10 - burn a new CD
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MAGIC FLIGHT