Singularity Center Block

I am a member of Triangle MQG and we are doing our very first guild QAL using the Singularity quilt from the MQG. The quilt is made up of HST and the center part - shown above - uses HSTs that finish at an inch!

I didn't actually read the pattern (which is available free to MQG members) to assemble the center but instead used my friends finished center to lay out the pieces. It is very possible I've messed something up but if you see something, don't tell me! 

There are 4 rounds of sewing in the quilt but I will likely make a smaller quilt and do only 3 rounds.

Have a wonderful day! Patty