Personally I would see what you got to start with and if it functions propperly I wouldn't change much. I'd put a set of night sites on it and "maybe" fool with a few recoil springs to smooth it out if needed. The thumb safety could get changed if it doesn't feel right. I'd can the beveled mag well extention as it just adds weight and bulk. Grips are up to the shooter. I tried the Hogue rubber grip with the palm swell thinking if I liked it I'd up for a set of wood ones. Guess what!.....the rubber is staying.
Keep it lean and clean!
Cocked, Locked, & ready to ROCK!