I have sandbox-1.2.18.1
Have tried:
FEATURES="-sandbox" emerge -1 sandbox
and can still not emerge nvidia-drivers or other kernel modules like vmware due to the access violation.
Portage 2.1.2_pre3-r9 (default-linux/x86/2006.1, gcc-3.4.6, glibc-2.5-r0, 2.6.18-rc4 i686 ...