I've seen this before - wonder how it would work - I thought part of the "trick" of the StriperTube was having the fish upside down and that had something to do with getting the toxins that work up in the fight to work through/out of their system.
While this is easier to store, the other issue I see is that it is pumping surface water across the fish (and then out onto your deck - hence the need for a working bilge - or good scuppers) - no good on the striper in warm months with warm water surface temps. The striper tube uses self-contained, recirculating water - so you can put cool water in there to start (or use a little ice to keep it cool).
I have a striper tube I won a few years back and I don't believe I'd use it with SURFACE water temps over 60deg. 65 tops. I just don't think a striper can live in that thing that long and make it even if it did swim off. It's a very simple setup..just a tube within in a box (to allow for recirculation) with a pump in the bottom of the tube to flush water across the gills. Really probably not hard to make one.