The sheet of morse code means the following...
When the game loads, hold shift & left-click on the speaker located at the top right hand corner.
On the last Ant mission (very hard to get to!), save your game and then load up a "build - a - base" mission. Sell a couple of buildings and you will hear "New Construction Options". You will be able to build a queen ant.
Tesla Tanks in Skirmish:
When you enter Red Alert, click on the New Missions bar. Then, click on the mission The Legacy Of Tesla. Build all the required buildings until you can build the Tesla Tank. Then abort the mission. Now click on Multi-player Games. Select Skirmish Mode. After you start a game, you should be able to build Tesla Tanks.