Reply by Lazyman

I don’t understand your description. Not sure how you would have 1 1/2” (in each direction = 3”?) tenons joining 2 1” thick boards (seat and legs)? Do you really mean a spline? It sounds like you are going to make a frame out of 1 1/2” boards and weave a wicker or cord seat? Are the 3” tenons for joining the frame perhaps?

Are there 2 legs the entire width of the bench or are there 4 and what width? How are you planning to attach the stretchers to the legs?

I agree. A rough drawing or picture would help.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.