I realize that the circuit shown in post #40 was to show how to drive a transformer that doesn't have a center tap, but there is a big problem with the way that the mosfets are driven.
The gates of the P and N channel mosfets are tied together. This means that there will be a brief time during switching transitions when both mosfets are turned on, causing a direct short between +12V and ground. This condition, known as shoot through, is a big killer of mosfets. Even when they don't die quickly, there will be a lot of power wasted.
**broken link removed**