Received a large Sycamore slab several years ago. 18 inches wide, 3 1/4 inches thick by 8 ft. long. It was over 4 years old when i got it and it sat in my shop for another 4 years or so. The tree it was from had fell across a driveway to a farm here in south Ga. The slab was rough, cut by a chain saw I was told.
Made a sled for the router to smooth both sides, ending up with a 2 3/4" thick slab. Removed the bark on the edges and sanded them out.
Cut one narrow end off to make the legs and feet of the bench. The bench top then was 48 inches by 15 inches narrow end and 18 inches on the wide end, After final dressing and sanding wound up being 2 1/2 inches thick.
Attached the legs using a through mortise with a walnut wedge. The mortise was cut through using the router and a pattern made of 3/4" MDF. The corners were then squared using a chisel. The tenons are 2 inches by 5 1/4 inches. The feet and legs are also through tenons.
Total weight about 50 lbs. The bench stands 18 inches tall. Finish is 4 coats of poly, no stain. Sycamore has lovely grain patterns and I wanted it to show.
The bench now resides in our bedroom and is used daily to help this old codger get his daily attire on.
One of my favorite projects.