This MOC is mainly based on virtual pictures because the OneWTC tower is still under construction (the top has been reached) and the 9/11 Memorial is near completion.
Two virtual pictures which have inspired the MOC :
The final MOC will be a mixture of both virtual images.
The 9/11 Memorial does not present any major difficulty : the two fontains are made with black tiles and explain the relative thick base.
The OneWTC tower is more challenging because of the straight lines running from the corners of the square base to the corners of the 45 degrees rotated square top :
The construction is inspired by the one of set 21001
where similar lines are represented by small steps.
Some pictures of the MOC
Close view of the Memorial
Any comments are welcome.