Sorry in advance. Not modding myself. Taking stick to a tournament that will have a modder there and need to know what to get before I go. Xbox One padhack thread is long and confusing. What do I need to buy from focusattack or paradise?
Technically, just a Xbox one controller pcb and the usual tools/parts, but the crossbone is recommended unless your modder has specifically stated that they will do xbone pad hacks without one.
Which tournament and which modder? If you prepay them they can likely do the purchasing and padhacking before they get there. Padhacking takes time, and time is valuable as a modder at a tournament where the quicker you get done the quicker you get on the next job and get paid.