*** This version works alone BUT i don't know if it works with previous USB filesystems. ***
*** Only for test alternate distributions like openwrt ***

Pagano provided the following information on what he did to make OpenWrt Kamikaze work:

/sbin/init included. (post changes to do it better)

#!/bin/sh
# Search autoinit file in devices -script to execute before init-
# and search autobootfs -file with ext2 fs- to mount and boot inside.
#
PATH=/bin:/sbin
mount -t proc none /proc
for altboot in sda1 sda2 sdb1 sdb2 hda1 hda2 hda3; do {
        mount /dev/$altboot /mnt
        if [ -f /mnt/autoinit ];then
                echo Found AutoInit in device: $altboot
                umount /proc
                cd /mnt
                mkdir ramroot
                pivot_root . ramroot
                exec /autoinit
        fi ;
        if [ -f /mnt/autobootfs ];then
                echo Found AutoBootFs in device: $altboot
                insmod loop
                mkdir /bootfs
                losetup /dev/loop0 /mnt/autobootfs
                mount /dev/loop0 /bootfs
                umount /proc
                cd /bootfs
                mkdir ramroot
                pivot_root . ramroot
                exec /autoinit
                exec /sbin/init
        fi ;
        umount /mnt
        echo Testing $altboot for autoinit file: NO
}; done
#
# No alternate boot found. Restore init and boot ram
#
umount /proc
mv /sbin/init /sbin/init.altboot
ln -s ../bin/busybox /sbin/init
exec /sbin/init
=========================

The /sbin/init file search for autoinit in storage devices and run it as pid 1. autoinit can umount ram0 and exec /sbin/init
It also search for a autobootfs (ext2 image) and mount it as root device, its usefull for vfat devices or single file.
The /etc/rc.d/rc.bridge file calls autoexec script to fix changes in firmware. It can load modules or execute daemons...
I dont know if it works with v3 usb filesystem.

Openwrt x86 Kamikaze image is working but it lacks samba server and webif^2 must be adapted to configure it.

The autoinit is:

exec /sbin/init

My configure system file /etc/init.d/rcS

#!/bin/sh
PATH=/bin:/sbin:/usr/bin:/usr/sbin
mount -t proc none /proc
insmod rt2500
rt2500apd
#Wireless Network settings must be in /tmp/RT2500AP.dat and info about it in MGB100_GPL/linux_src/drivers/net/wireless/rt2500/README
ifconfig wl0  0.0.0.0 up ;
ifconfig eth1 0.0.0.0 hw ether 00:80:5A:49:70:69 up &
ifconfig lo   127.0.0.1 up
/etc/init.d/dropbear start &

# Remove comments to release memory.
#umount /ramroot
#freeramdisk /dev/ram0
#rmdir /ramroot

brctl addbr br0
brctl addif br0 eth1
brctl addif br0 wl0
ifconfig eth1 0.0.0.0
ifconfig wl0  0.0.0.0
ifconfig br0 192.168.2.10 up
route add default gw 192.168.2.1 &
echo nameserver 192.168.2.1 > /etc/resolv.conf
====================

My RT2500AP.dat

[Default]
SSIDNum=1
SSID=WHD.AP.NAME *******change it*****
HideSSID=0
CountryRegion=6
WirelessMode=0
TxRate=0
Channel=7
BeaconPeriod=100
DtimPeriod=3
TxPower=50
BGProtection=0
TxPreamble=0
RTSThreshold=2347
FragThreshold=2346
TxBurst=0
TurboRate=0
NoForwarding=0
ShortSlot=0
AutoChannelSelect=0
AuthMode=WPAPSK
EncrypType=TKIP
WPAPSK=wpa.password ******change it *****
IEEE8021X=0
ReKeyMethod=DISABLE
ReKeyInterval=
AccessPolicy=0
AccessControlList=
WdsEnable=0
WdsNum=0
WdsList=
====================