Where would I get these items for my cosplay?

For the upcoming NYC Comic Con, I’m planning to be Nicholas D. Wolfwood (I was Big Boss last year and it turned out really well).

I guess this question is more if you watched the anime show Trigun. But I’m not sure where to get some of the stuff. How am I going to get/make the huge cross? Any ideas? Also, the crucifix cufflinks would be nice.