The pickguard will be ok with the pickups and the pickups will also be compatible with humbucker route, no need to fear... but you will need screws
Neck plate: I suggest one custom from our good friend Dangerous R6 here...
Switch: yes 3 way, for the easy... you could mess around with the schematic, but looks like you don't know much yet about it, so you would better put the 3 way...
Electrics: four 25K pot, two 0.1µF capacitors for tone control if the pickups are EMG
The jack must be stereo (said on EMG site) don't know why
EDIT: I forgot the bridge... well if you want a tremolo bridge this is ok, in the picture you've done a hardtail... then should be like this, if you want hardtail (non-tremolo) http://www.warmoth.com/hardware/bridges/bridges.cfm?fuseaction=vintage_strat_fixed