For anyone interested in going the Pelican route for rear storage, two BX90r cases would be near perfect for the rear of the LR4.
I bought one for the purpose of just trying it out, with the idea of building some sort of box that two of these would slide into with a carpeted false-floor above them.
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Ignore all the other crap in the back. Moving things around and trying different things out.
Benefit of this would be that, unlike drawers, you can easily remove the Pelican and carry it somewhere. You can also strap it to a roofrack and use the rear for something else.
Downside for me (at least with this particular model) is that the cargo/dog guard makes it so I can't stack these in the rear. The cargo guard angles rearward about 14" off of the floor and decreases the effective length of the rear storage area.
That all said, I think I may go a different direction. As much as I hate to give in (and have not wanted to give in for the last 20 years), the ubiquitous overlander drawers may be the direction I go.