Sunhokey PRUSA I3 Improved Endstop Holder and Add Power Switch

I purchased a PRUSA I3 3D Printer Kit from Aliexpress. I finished assembling it and managed to get it work (surprisingly it works quite nicely).

It is pretty basic and some of the parts (like endstop holders) are not fixed firmly due to the 3d printed parts which was a generic design and keeps on moving from time to time.
Also I don't know if its just me, but I feel its not complete coz it's lacking a power switch. It was a plug and play setup.

I made some improved endstop holder desig