First, to Cammy, that is the coolest AGA Workbench I've ever seen. Unbelievable. But . . . I'm a graphics card guy. At least after running OS 3.1 on a 1084 recently. Scary stuff.
I would support a bounty for an OS 3.x version of OWB, etc. I often like to use AmiKit or AmigaSYS on my PC, but get frustrated by lack of a modern browser. With a modern browser and a Catweasel, my PC Amiga use would rise exponentially.
Every other idea in this thread sounds good, too. I love 3.x and would be overjoyed to see new apps. And even though most users of all the WinUAE variants are probably gamers, I'm sure there'd be at least some support for nice apps. And I do still hope Natami appears. But if not, there's other possibilities.