So what has technology modder extraordinaire Benjamin J. Heckendorn come up with for his Ben Heck Show this week? Why, a laptop designed to fit on a airplane tray table, thanks to a special swiveling screen. The Coach Section Laptop is a modified Toshiba Satellite with aluminum arms affixed to either side, with slots down the middle upon which the screen's pegs slide. Thumbscrews then tighten to keep the display in place in either of two modes: the standard laptop configuration, or the floating display-over-keyboard setup you see immediately above. Ben himself