Cargo drawers and 3rd row seat - at the same time

Hey all, I'm looking at making a set of rear drawers for my 80 Series Landcruiser, but have run into a small problem coming up with a design: I have 2 kids some of the time and use a roof rack for trips, and have 4 kids on other trips and take a box trailer. I only need to use one of the 3rd row seats when I have all 4, so want to use the entire back space for storage other times.

The drawers I'm thinking of are similar to the pic below, but with a cage added to the top half above the drawers to make it safe for the 3rd row seat on the other side:
Verticle drawers (except without the full cargo barrier thats pictured)

A normal cargo barrier split down the center with one half of it able to swing 90 degrees like a gate and lock into either position would be ideal! I just can't figure out how this would work with the angle a normal cargo barrier sits at, and how to make it structurally sound as well as safe in both positions....

The only solution I can come up with so far is to have interchangeable barriers and swap them out depending how many kids I'm taking:
-- Standard style full cargo barrier for when I have 2 kids
-- Cage off above the drawers only when I have all 4
(Use wing nuts or bolts with handle welded on for quick release)

Anyone else had this problem and found a solution?
Anyone got any general thoughts or ideas?

Cheers
NUTS!





Cheers
NUTS!