I bought my first the day the Klinton ban sunsetted, thanks to Chris over at SemperFiArms, the remainder were built.
He showed me the process involved and walked me through it as a novice, showed me the tips and tricks to the assembly and in the end I have a greater appreciation for the rifle as it was built by me.
To me you could go either way on the original question, the available parts and assemblies for the platform are readily available so making it what you envision is only a few searches away. The other side of the coin is many manufacturers offer great buys on a turn key rifle with a factory warranty on many.
Search, ponder, take information from those here who have been down these roads already and you will no doubt come to a sound decision soon.
Have fun and enjoy this great sickness that has bestowed upon us.