naquaada ----->

Yes that's a good idea but I can make a distribution package to update the spare partition (on which you have restored Beta 2) too. This will be more easy to do.
This way after update if all goes well all you'll have to do is to recreate a bootable ISO.

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Mac OS X 10.6.3 • 2.8 GHz Intel Core I7 860 • ASUS P7P55D • 2 GB 2 Ghz DDR3 • ATI RADEON XFX 4890 1GB • 2 x Hitachi 160 GB Serial-ATA • PIONEER DVD-RW DVR-112 • LaCie Desktop Harddrive 750 GB USB