A couple observations with this:
Are you sure you used a 10' 4x4? considering the perspective of the 8' ladder right next to the stand, I would say that is an 8' 4x4. Unless you bought a 10', then used the extra to make your angled wedges....
The conduit you used, did you actually measure the OD of the pipe at 1 1/2", or is it bought as 1 1/2"? The difference being that conduit spec'd at 1 1/2" is the ID, not the OD. The right size hole saw or spade bit would be ~1 7/8".
Just thought this may clear up some confusion.
Great design though.