Sierra Wireless USB881 3G Modem WAN on WRTSL54GS via OpenWrt Kamikaze

As noted in a previous post National Shame: Swaths of Non-Rural US without Broadband; Time for Re-Divestiture, there is no Cable Modem service or DSL in my neighborhood. Up until a few months ago, I did have a pretty nice point to point Dual Raido Full Duplex 802.11n connection that could do about 12Mbps symetrical. [...] [...]