The next day, cut it flush. Use a block plane to ensure it truly is flush. This will be the top of the bottom layer of the bench top, so gouges aren't a problem. (Wiping up glue with a damp cloth can lead to stains and finishes applying unevenly. That won't be a problem here, either.) But bulges and bumps are a problem - they will keep the two layers of the top from matching up evenly.
Stop it. Really. I mean it. Pick a height between your thigh and waist that seems right. You’ll adapt. Don’t worry about your back. You’ll adapt. If you are really uncertain, make it a little taller and then cut down the legs. After a decade or so, your work habits will put a magic number in your head. You’ll have built enough furniture that you will know your number. Until then, pick a number.
Our stationary equipment runs the complete range from heavy-duty industrial machines, to inexpensive home shop type of tooling so that each student can compare and contrast the range and versatility of equipment at a wide variety of price points. We spend time on what makes a good machine good, an adequate one adequate, and a lousy machine worthless. We have no commercial sponsors and will share our opinions based on our experiences regarding the quality of one manufacturer over another. There is no better place to kick the tires on a variety of equipment than at our shop.
My bench is MY BENCH. In other words, it’s a thing of evolutionary beauty. I built the top 10 years before deciding on and designing the base. I spared no absurdity. It is supremely stout and the much maligned drawers are accessible from either side. The larger drawers have dust lids and can be extended to provide support for large workpieces or as a step for climbing on top of the bench. The top alone weighs more than most Roubos. So NYAH! Did I mention that I designed it to fit in with the Arts & Crafts vernacular? Who said you can’t build your bench to be furniture? Beautiful as well as useful shop furniture? Just sayin…
My first shop was a 8 x 10 ft room, actually a bedroom, with 10 ft high ceilings in a older home in Chicago. I had a 10" Craftsman TS, drill press, 8 1/4" Skil saw which still works, some welding tanks, hand tools and... my bed was a loft across the 10 ft length 4 ft down from the ceiling with a ladder against the wall to get up. I was 16 yrs old then, now I am 66 yrs, have 2 shops with Craftsman power tools up stairs, and Grizzly tools ,a Powermatic 68, a MIG welder, and other tools on the ground floor. I've come a long way, You think? I remember making bases for sculptures called "plinths", my first commission, in the living room, 5 pieces rather large, several ft long and wide. The house was haunted, and my mom told the "spirit" to leave and go back downstairs. There was a cold draft and the straw chair would rustle with no one sitting in it. Wow, does that bring back memories from the '60's.