If it was me I would build the car with the LAW36 & LAW37 rear hinge pin mounts purely as they are a real bonus for tuning (standard plastic parts are as strong as any other plastic hangers so no NEED to change).
I would make sure that you have #70 & #75 springs for both front and rear along with #60 & 65 rears as well if your planning on running the car light weight.
I keep the 1.4 & 1.6mm anti roll bars along with an additional 1.2mm (work on either end of the car) to compliment the kit 1.0 & 1.2mm bars ... how often do I use them??? Truthfully hardly ever but when I need them I am truely thankful for there presence
I would suggest that you get a set of white slipper pads as well, they aid tuning again rather than being necessary.
Other than that it's all in the box ... you actually can build a box stock kit and put it straight into the A final ... ask Rich Cree
Let us know how you get on with the car.