I just finished the last bricks of my oven. And I'm curious about some of the next steps.

1. I crawled into my oven and relaized that it is not completly smooth between all the layers. Is it worth it the bring the grinder in and smooth everything out?

2. There are some gaps between the bricks on the inside. Should I be attempting to put mortar into the gaps to close things up?

Thanks for all the help.