I think that belt might be a found item, pretty much unmodified. Looks like a rechargeable battery belt used back in the day (before batteries got small and more powerful enough to be connected directly to the equipment) by TV news photojournalists to power film or video cameras and sound gear. The juice was delivered via XLR cables, the connectors for which can be seen in the pic.
A belt very similar to that was gathering dust in the corner of the photog gear room at the TV station I worked at in the 90s.