Need help. Neighbors want me to build a table like this with this bench to match. Table to be about 6'x3' and the bench about 6' long. Wood they want me to use is some reclaimed cargo flooring that is 1.25" thick. Not too concerned about the table. I am concerned about having a bench that long with the waterfall style in which I plan on just using floating tenons in the miters. Seems like potentially lots of stress on the miter joints when adults a sitting on the bench. Trying to get them to consider some other reclaimed stuff that is 2" thick. Any suggestions on ways to strengthen the miter or am I being overly cautious. I am an engineer and tend to stick to the belt and suspenders way of solving problems.