There are 2 different versions of the model, BF stands for Blended Fin and looks slightly better while SF stands for Simplified Fin and is a bit easier to build (please see the first post in this thread for images of both versions). Obviously you don't need to cut both, you just need to cut the version you want to build.
The laser cutting files are grouped in folders depending on the materials used, you just need to go into each folder and count the number of balsa sheets needed. Some sheets are 500x200mm, which means you need to cut a 1m long balsa sheet in half and join the 2 pieces together with CA adhesive before laser cutting.
The 3mm balsa sheets are mainly used for the fuselage, and the 2.5mm balsa is for the wings and stabs, but you need to cut all the sheets for a complete model. Maybe you can cut the 6mm and 10mm balsa parts by hand, since there are only simple rectangular shapes with a centerline (used for wings, stabs and rudder hinge lines).