I tested todays build and it is looking much better in WinUAE.
It's a shame that the preferences aren't set better. Until you tweak it, it seems really bad.
Screen refresh in non-truecolor modes is painfully slow. You can watch the pixels draw in, even on a fast WinUAE system.
Use the new build of WinUAE or else it won't run.
Use the nightly ROM and System HD folder from Sourceforge.
Set it for a stock A1200 with extra fast RAM (16M+ I saw some huge memory use/leaks in Wanderer)
Enable JIT and Picasso emulation
Painfully get into preferences and set the screen mode to a 32bit RTG mode and save (test doesn't seem to work)
Restart WinUAE after this, otherwise it doesn't seem to really pick up on the changes, causing other redraw problems.
At that point it works fairly well, but it's still pretty buggy.