Only 6 steps required to create a 3D text. Here we go :
1. Create some Text, use a nice plain bold font
2. Duplicate it with ctrl-D
3. Colour this text differently from the other text and slighty offset one from the other.
4. Break apart ctrl-B both letters
5. Use the line tool to join corners to give the block effect (use the magnetic tool).
6. Fill in the spaces between.
Joining the edges of curved text can be a little more difficult to align.