Assembly time! I decided to secure the stretchers with screws to facilitate removal. The screws hold the tenons in place. Will this gradually become wobbly over time? I hope not, and if it ever does become a problem, I can always remove them and drawbore or glue them up. In the picture, clamps are holding the two outer layers in place for glue-up. I did not glue the legs in the benchtop... I know one day, my shop will be more than a storage shed, and until then this bench and everything else I own must have a measure of portability.
I used the leg vise to hold the outside layers while I cleaned up some of the joints - it worked beautifully.