Re: first trap out
Use an 1 7/8 inch diamond hole saw and drill a hole in block. Insert a piece of 2 inch pvc pipe about about 8 to 10 inches long in hole.
Use 1 7/8 inch holesaw to cut a hole in your nuc.
Attach to nuc by slipping pipe in nuc and adding a 2 inch to 1 1/2 reducer or bushing.
Make sure your nuc is setting on something stable, ladder or frame attached to wall with tapcons.
Who knows, what you have may work just great.
I love the pvc as it is extremely versatile.
It takes a family to raise a family, it takes a village to really screw that up... Djei5