Help with second floor for MOC

Hey, i'm currently building a large Arkham Asylum MOC, which is 64x61 (with a slight U-Shape). I built the base of the second floor with a mix of 4x8 , 6x8, 4x10 and 1x8/1x4 and started to build on it, but it was very flimsy and ended up breaking off when I was lifting it. Any MOC builders got advice how to make it far more sturdy for the slightly strange shape here to prevent it collapsing again. submitted by /u/BITWbatz96 [link] [comments]