STOP THE COMPUTER FROM REBUILDING ROCKET TURRETS
Destroy the computer's construction site, then it cannot rebuild buildings (though it can repair them). You can try leaving a heavy tank or two (siege tanks or above) beside the destroyed turret. Thisis a good position to attack from as well, as the tanks are tooclose to be fired upon with missiles and are able to attack theturret from both sides while the turret can only attack on tankat a time. When the turret is rebuilt it is damaged from beingplaced on bare rock and so is even easier to destroy

TO STEAL SPICE OR NOT TO STEAL SPICE
In general, it is fairly pointless. Once the Silo is damaged "into the red" so that youcan send a set of soldiers in to capture it, it will generally be attacked immediately by the surrounding enemies, and destroyed in a short space of time

WHAT BUILDINGS TO STEAL
Vehicle Factories : produce House Weapons (Sonic Tank, Devastator, Deviator). Windtraps : easier than building your own. Spice Silos: instant money, if you could be bothered. If you capture a building inside the enemybase try and surround it with rocket turrets to hit enemy vehicles etc as they are produced. The rocket turrets howeverwill not fire upon enemy buildings.The negative points of capturing buildings are : (a) The soldiers take forever to get there. (b) The soldiers often get killed before getting to the building. (c) It's very hard to keep a building in the red without destroying it