While its not designed for the sole purpose of an electrical/electronics box for the relocation of items from under the drivers seat, it can and (is in my case) be use for such. I also have installed the LT77 & R380 Center Seat Tool Box from YRM: 
LT77 & R380 Centre Seat Tool Box - YRM Metal Solutions  under the MUD Cubby Box Locker and am using it as a heat shield as well as the location for all new quick connects I have installed for the loom to and from all the parts that were under the drivers seat. My ECU I've also put an extension cable onto and will be routing that up the B Pillar into my roofs center line console (includes the A/C unit). I picked up some 36 core cable (not cheap btw) and will run to lines up the B pillar (may have to be one per side - yet to be determined). Inside the Locker box I installed all new components to replace the old tech gear (Circuit Breakers, SS Relays, 3 Double Port USB charging stations. All the C/B's are mounted onto an Aluminum plate I made up to fit and that mounts at the points that the cubby box has for its internal dividers that are provided but I don't need.
The LT77 & R380 Center Seat Tool Box is made from aluminum and needs to be aluminum brazed on the corners to make it water tight, luckily this can be done with a propane torch and cheap aluminum brazing rods that one can buy off the internet (amazon, aliexpress, ect). This is then drilled with 60mm holes to take the connections and cable loom from engine bay to Box. At this point I installed 2 Bronze Compression gland for both looms coming in, and will install 2 more for the 36 core cables going out to the relocated ECU.
So, yes its not designed on purpose as an Ex Box, but since there is no alternative (and would appear that no other will be forth coming) and with a little out of the BOX thinking (LOL) one can make do with what one has on hand.
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