Yes!....er, No

Laid the peninsula on the ground and it was pretty flat so I glued and screwed the top while kneeling on it hoping the extra weight (and yeah, there's some extra weight!) would keep it flat and square. Next I trimmed the piece to fit between the left and right corner pieces and under the electrical outlet and with Adam's help put it in place.

Mostly level

If you zoom in you'll notice that the front and rear levels are darn near perfect. You'll have to trust me that its level from front to back, and it is. But...wait...what are those gaps of light under the orange level. DARN! This will take some thinking.