Good move with getting replacement dampers at the same time, at least you're halfway to getting it done properly
With a 50mm drop it's going to be very harsh as you will be sitting close to the bumpstops even with just the car's weight at standstill. If you really must go that low make sure you fit new bumpstops which are designed for lowering (they are shorter but firmer). If you keep the stock ones, they will surely disintegrate within a few 10,000s of Kms. Do NOT just cut the stock bumpstops shorter unless you want to risk killing the KONIs.
Definately need a roll centre adjuster and shorter swaybar endlinks if if you are interested at all in having decent handling (Which I assume you are because you aren't just fitting springs). Definately need camber kit (front and rear) unless you wanna chew through tyres or you want the crazy drift look.
Although your car will be unroadworthy and the handling very harsh and bottoming out regularly, it will look really sweet
. Also at that amount of lowering the KONIs won't last anywhere near as long as if you had a modest drop of say 25mm. (You will have to dial the rebound damping to at least 3/4 but probably 1 full turn or more. From memory max adjustment is 1.5turns).