Thank you Captain....I was thinking that I had wiggle room for a maximum tolerance of plus 1/8" (0.125 inches). So I think I should be OK for the following without making any additional cuts:

Large Bowie Knives (#12-8", #12-9", Small Sasquatch)
1 3/8" (1.375") × 1 1/2" (1.5") × 5"

By the way...those are pretty good guesses on the wood type--especially the first two you named. However, gonna keep you hanging just a little longer.....