OS X 10.6(.0) DVD to USB to boot

I am attempting to make a 10.6 USB installer from a 10.6 DVD.

The DVD is 10.6 (plain / base)

I have used 8GB and 16GB flash drives.

I launch Disk Util and go to restore, as source I use the Mac OS X Install DVD, as destination I use the volume on the USB drive.

The error I see is"
Restore Failure
Could not restore - Cannon allocate memory

This is on a MBP 4,1 C2D 2.5, 2GB RAM running 10.6.8 (updated from the 10.6 from the CD install).

I have tried Lion Disk Maker X on another machine, but it does not go that far back (no option for SL).

Thank you.

I partitioned and formatted as above already.

I also made a DMG out of the install DVD on another machine, and used that DMG to restore to USB.
When I boot from that I get a kernel panic right away.
Unable to find driver for this platform: \"ACPI\".\n~@/SourceCache/xnu/xnu-1456.1.25/iokit/Kernel/IOPlatformExpert.cpp:1389

I cloned the 10.6 (plain) to USB using Super Duper.

Worked like a charm.

MBP 4,1