You are running behind the market. Pick your choice from already available solutions:
F6BVA - 20W with MW7IC2725N, DIY project
SG Lab - 20W with PA2400, readily built
Rene PE1CMO - 20W with BLM2425, readily built
Further options are: the 30W Spectrian driver board readily built with small mod to do, the Andrew MRF21045 modules with15-20W (with mod to do) and several other UMTS boards.
For sure there will be more designs applicable.
73 de Cor