I would love to have the pieces overlap and get in the 501st. I have tried using bobamakers-Daz harness with his heavy fiberglass jetpack, which I love. But, the weight of the jetpack, kept sliding down the backside. I have tried adding a few extra straps across the front and the lower back. But, the weight just wasn't working. So I switched to a BBF harness, which is great at supporting the heavy fiberglass jetpack and the solid cast extras... rocket top, jetpack nozzles... I am a regular sized guy 5'-9" - 150#. I have tried many combinations of strap adjustments to no avail. I even had to fix my BBF harness straps. They were either sewn to low or backwards, they were about 4" shy of even reaching the backplate openings. I fixed that by removing the straps and placed them farther up the harness. Works great, but still no armor overlap. I purchased bobamakers - Daz fiberglass armor, which I love in about the range of 2010 -2012. There is just not enough material for the backplate and collar to overlap. Which I am still happy with. Next step, weathering the vest before permanently attaching the collar piece to said vest. Still working from the neck down...