ok im going to start sculpting a predator 1 backack. whats the best wat to go about sculpting something that big? should i start with a basic foam structure of it then add clay to it for the final sculpting and details, or just start fronm a huge lump of clay. im shure its not gonna be completely screen accurate since i cant find many pics of it from the different angles. but im gonna give it a shot from the pics i have and the model kits and mcfarlin figures i have avalible to me.