I ran out of space myself so I had to think "OUT Side the box" so I put two cabinets on the each side. Cabinet 1: electrical outlet box which has control fan, was getting a little hot in the summer.Cabinet 2: dosing area 3 compartment 2 gallon dosing chambers, GHL doser should've been here two weeks ago .benches make for good viewing area for my kids,I would love to leave the cabinet open but there is no way for a couple more years.looks great have fun!