I made some boxes about 10” x6” about 5” deep with rope handle loops through the ends, one for home tools and one for shoe cleaning kit, just lap jointed. Also a shop counter for a Charity shop.
Thing to note if glueing T&G together is that usually the top surfaces of the floorboards touch before the bottom edges so if not careful it won’t produce a flat board, as you cramp it up the board rises up. And of course the underside of the boards often have relieving grooves running along to help stop cupping. Ian