Well you say you want to upgrade from a stunt to a Crystal Focus v9 soundboard so in that case you will also certainly need a speaker to let the sound out eh?
An internal chassis of some kind, either rod and disks or 3d printed, is strongly recommended to protect delicate components like soundboards if you plan on dueling.
If you intend using a fixed battery solution you'll also need a recharge port and charger with matching plug, though not if you are using a removable battery holder instead.
Note that Crystal Focus boards can be set to reuse your present stunt latching switch for activation but you'll also want to add a momentary switch for auxiliary functions like blaster block fx, voice menus etc
Wire and heatshrink are required of course and an ESD-safe soldering iron is preferable for wiring boards...esp expensive ones like CF.
As Chadm notes The Custom Saber Shop has a wide selection of most of the parts you'll need including chassis disks (3d printed ones are available from Shapeways and you'll need to find optics for that particular LED which I'm not familiar with elsewhere) and also many useful DIY sabersmithing tutorials on the TCSS forums.
Welcome, Good Luck with your build and MTFBWY.