No problem
Every part you need to build an 'Awesomo Makehappy 9000' projector is available from various members of this forum, but before you even think about buying parts you need to read and read other peoples build stories.
Build it right and build it in a way that allows the system to grow without removing and replacing parts when you want to upgrade. For instance; instead of building a medocre RGB, build a much higher spec single colour, then add other colours when funds allow; it will save you a fortune if you do it this way. Buy smart and buy once.