If the lid has to stay open to use the unit, it kind of defeats the whole concept of portability of the battery pack. It IS portable, but not as effective as the Alienbees Vagabond Packs (your main competition) or the Genesis 300B System battery pack - while it looks great, functionality is something people place a bigger premium on than aesthetics, especially the professionals.
If it were up to me, I'd just remove the top lid entirely, and add a handle or a strap that I use for carrying the unit. Alternatively, maybe cut a couple of openings for the fans and a few lines for the cords to run while the unit has the lid closed.
Honestly, while your unit is nice, there are a couple of design flaws from what I see - and I think some DIY battery packs made by some of the folks here are actually better.

