I am midway through a disassemble of the N700 lapdesk. Basically you remove the two panels to the right and left (they come off quite easily). Under there you find four screws on either side which removes the middle section of the top panels (it is divided in 3), this unfolds the cooling fan which allows for light dusting. If you want to take off the lower part (where the two stoppers are) you just remove the 5 visible screws. It comes off fairly easily, but it is popped in place using some sort of holding mechanism. Just follow the two rails unfolded at the corners in order to remove it.