This is a beautiful tuning you guys are talking about here. For sheet music you can use anything with guitar diagrams or chord notation, but still have a deep, rich, ukulele sound.
If you are serious about playing this way, what you should get is an instrument about the size of a Tenor, but with a deeper body. The standard Tenor body is just a bit too cramped for this deep range of notes. It's why so many dropped this tuning and migrated to key of C.
The other thing that would be ideal is to have a longer scale. With a longer scale you wouldn't need a wound 3rd string like the Aquilas. You could you use something like the arrangement rae worked out, but with better tension, and therefore better performance.
Since this is much more of a normal tension, true ukulele tuning, the final touch would be to move away from the heavy construction of modern Big Ukes and have an instrument that was built lightly - like an
ukulele, and not a little guitar.
But who makes something like that? How about Southcoast!
Our new standard models have finally started to come up. They're into finishing now and pictures will start going up shortly. In the meantime, the page has the old pictures, but the info is current. The sound samples at the bottom include this tuning - click on the
high re-entrant G (strung with our Heavy Gauge Ukulele strings).
http://www.southcoastukes.com/index_files/inters.htm