My advice to the first-time K8200 builder:
1.) Get a borosilicate glass plate to top your heat bed. The flat (planar) build surface will save you a lot of heartache!
2.) The adjustment screw for the Z-axis limit switch is a bit flimsy. You will want to modify this to be more solid, for better repeatability.
3.) I put four small compression springs over the support screws for the bed, and only installed one thumbwheel at each corner. This makes bed leveling easier, as you don’t need to tighten the lower thumbwheel against the upper one.
4.) If you have a good supply of stranded wire, you might consider using it in place of the ribbon cable provided in the kit, although this is not strictly necessary.
Take your time building it, and make sure everything is square before you tighten any bolts.
Those are the most important enhancements during your initial build.
One last piece of advice: Eventually you will want to upgrade the extruder. Many folks here, myself included, swear by the E3D extruder, but fitting one onto your K8200 is a major project. If/when you do, you will probably find it best to switch to using 1.75mm filament instead of the 3mm stuff you are using now. So don’t buy too much 3mm filament right away!
Enjoy the build, and happy printing!