Simply place them all next to each other like this. (assuming you have 6 pieces)
on layout start
part 1 - set position 0,0
part 2 - set position part1.width, 0
part 3 - set position part2.width, 0
part 4 - set position 0 , 0-part4.height
part 5 - set position part4.width, 0-part2.height
part 6 - set position part5.width, 0-part3.height
this puts them in a 2x3 grid
im sure there's a fancier way to do it with an array, but im not as good that those.