David
I have had a look at the datasheet, for one device there is a lot of gain compression when the output is up at 100watts.
To get a clean and linear 100watt output would require two devices.
Filtering on the output to suppress harmonics is essential.
From my experience with lower powered amplifiers, without a decent LPF the second harmonic can be a high as -20 to -15db below the carrier.
A very poor situation.
As far as your project goes, I am not the guy to help you with PCB design and construction, I avoid it as much as possible!
I much prefer "ugly" construction techniques.
JimB