Welcome to the forum!
Firstly, I'm sure American dealers will carry the WarPig, it is one of BKP's most popular and famous pickup, for a reason, they are utter beasts, a mate of mine has them and they really do shout the place down!
I'm pretty sure the guys can customise the cosmetics of your pickups to however you want it, I've seen some pretty cool so far and I the only problem I can see is getting Gold Allen Head bolts for the 'Pig.
Payment: Again, I'm sure Tim or Steve will come along to clear this up with you too, the best thing to do is to shoot them an e-mail with your requirements, they are more than happy to help, very enthusiastic and great guys (which reminds me, I need to order some camo single coil covers!)
Andy!