Pots are all 500k which shouldn't be an issue as that kit comes with a neck humbucker (best suited to 500k) and a single coil bridge PUP which are usually best suited to 250k. Only difference might be a slightly brighter or more top end in the bridge PUP which may not be such a bad thing to have.

Grounding is most important as if not grounded properly there may not be any sound transmitted, plus ground wire to under bridge helps with reducing noise when your hands are off the strings.

Shielding is advisable usually on the bottom & sides of the control cavity and some reckon on the underside of scratch plate too which is quite common on Strat's. Personally, I have not bothered with shielding back of scratch or control plates with zero buzzing or noise issues. You could always do a few sections then plug in and see how things are and whether it needs more shielding to eliminate any unwanted noise or buzzing.

Cheers, Waz