Did you get the left/right hole drillings in the rim matched up to the correct side of the hub?
The compression of the rim actually binds the seam together very tightly. So before I add tension with the spokes, I'll use a crescent wrench to align the rim-edges together at the seam. Then once it's tensioned, the rim-ends are forced together and held tightly.
The mis-alignment you have is way too much, even 0.1mm is enough to cause brake-shudder and pieces of the rim can flake off and get embedded in the brake-pad and scratch and wear out the rim prematurely. Personally, I'd undo the tension on the rim and re-align the seam to it better, then tighten it up again.