Maybe keep the design similar to what you have, albeit a lower angle. Make the current front table ‘slab’ just a frame, and hinge a slab at the bottom of the frame to allow it to pivot. It’ll add some thickness, but you could probably hinge the triangular supports off the sides of the frame so they nest inside it (the frame), which would cut down on the thickness and make it one piece…if you can workout a kickstand for the adjustable slab. 

Ryan/// ~sigh~ I blew up another bowl. Moke told me "I made the inside bigger than the outside".