Hey Daz,
The spec sheet from Nike has the PCO and PCT at both 47° for the PW.
That leaves us a 7 degree gap assuming both your PW and SW are to spec. This would leave you right around the 51° range. There'll be a slightly bigger yardage gap between your SW and GW than your GW and PW, but most folks use the GW for full swing, so in this particular instance, you'll want your GW to follow down from your PW, I would think.
As for bounce, the 51 is stock 6°, and that should be plenty. Great for all lies, including hardpack bunker.
Now, if you want to get particular, you need to bend the 51 1/2° weak, to split the distance between your PW and SW. You'll need a bending machine, ideally. I've known guys to lock
clubs in a vise and go to work on the head with a rubber mallet, but how do you measure accurately what you're doing?
Your best bet, Daz, would be to order one up ready made. Get them to hand-pick one that's 51 or 52 degrees, and 1 degree up (65° lie). Or if they don't hand pick (but do assemble), then they should bend it for you that way. Generally speaking, you buy the components, and assemble them yourself. However, lumlum has pointed out that bighitgolf.com seems to sell them assembled.
IF you've got your heart set on going with a 52, you need to know that whether you bend the 51 weak or the 53 strong, you'll have 7° of bounce. In other words, opening up this club from a tight lie is NOT recommended.