This is actually a concept. I coulnd't find any info. Sorry. I wil post it as soon as i find something about it.
The aft bottom bump ... It just seems like it would cause a lot of drag and even with it the props are still mounted pointed down like on some small speedboat. And the rudders look exposed to damage. Something this big could do better. Even large skegs shrouding Z-drives and offering more protection to props and rudders alike might be an improvement and still allow for the glass bottom.