Plz be sure to look at a previous post regarding corners w/ holes.
I gave some pretty good advice about filling the holes with a mix of Brick Dust & Concrete powder (that will make the bricks solid - and the color will come very close to matching). I’ve done this route myself and I know it works great
Another oven builder gave some great advice (with pics) on how to build your corners with a 45° so you won’t see any holes at all… And it looks TOP NOTCH TOO!
