UK360 COMMANDO had some additional tips for a few of the more difficult Nod levels. I'll post them here for others to see.
I used No.1 Richy's solution for Outback on Gold as although yours worked for me on Silver, it was too tough on Gold.
Also on Killean's base I followed your guide for Silver but it was tough. On my Gold playthrough I held off destroying her Temple of Nod and sent my army around to the North East and captured the Silos and waited for my Nuke to become available. It was easy to just take all the time in the world killing a few Commandos and the odd Engineer, no real problems once the Air towers were down as you suggested. When my army and Nuke were ready I finished the TOD off with the Vertigos and the map expanded. As soon as that happened I moved my army over to the right slightly and destoyed the ION cannon base while nuking and Vertigo attacking the North East base. A little clean up with my army was all that was needed.
Oh and on the last Level for Nod, using Vertigos on the Juggernauts always killed the husks of the downed ones, I used Venoms after I'd cleared AA guns.