Looks good man
How'd ya cut the slots?
First I measured the spacing - 2"
then the depth 3/4"
Clamped both pieces together to save drill time, drilled out all the holes with a 3/8" bit after drilling port holes with an 1/8" bit
Set the chop saw the 45*
Cut each side individually after using a square set at 45* to mark the insides of each hole
took more time but the clamps would have been in the way of the fence on the saw.
Used a rasp the rough out the cuts that didn't end up being exactly 3/8" wide
Then ripped a piece of wood 1/16 under 3/8" to allow for sandpaper thickness
Rounded both edges of one side of the piece of wood with a sander to get the inside of the holes
Used 80 grit paper to sand every one of the slots making them look nice.