I normally have 3 builds going at any particular time. My process is pretty simple. Open the box and dump everything out. Set the empty box to the rear of the bench and then all the parts off the sprues. From the empty box I work forward to the front on the bench starting with the body parts, then chassis and related parts, interior, and then engine parts. The next kit will go to the left and get lined up and the 3rd kit further to the left. I might be fortunate in that the bench for separating kit parts is my stained glass bench and measures 8' x 3'. Plenty of room.