The Triple Shot has been discussed on this board before and I even posted my idea of what the wiring should be based on two SPDT switches. It seems that it actually uses two DPDT switches, and I'm assuming that is to prevent "hanging from the hot" on one of the single coil choices. (Personally I think the 2 SPDT switch circuit is quite sufficient for the job).
So, I've drawn a 2 DPDT diagram of how I think the Triple Shot is wired. It looks okay to me but does it have any wiring problems?
I think your diagram is fine, but this is a tough scheme to visualize, so let someone else weigh in.
Your diagram looks equivalent to ChrisK's DPDT version, yours is wired a bit differently but to the same effect. I know this one is right because I've used it twice!:
I like my P-Bass with this wiring a lot, you get used to the selections really quickly. I have "both down" as the series setting, both up as parallel, using P/P pots. With the Vol knob (intuitively, closer to the neck pup) up, it gives neck only, with the tone up bridge only.