I think this is a fantastically innovative piece of engineering. It's obviously not conventional thought and it is a bit visually challenging, but it ticks a lot of boxes in terms of twin engined aircraft requirements, including keeping the wing free from nasty nacelles and protuberances.
I'll bet a Mr Bent is doing a merry jig because he can sell twice as many engines to Mr Stiff.
(do you have to have a funny surname to be involved with Jabiru...?)