It wasn't very clear from your post if you're looking for something along those lines that works on the beta client.
I'll assume it was
Links by Jerry works on the beta for opening multiple itemlinks.
You might have to update the included Ace3 libraries to the most current trunk version.
CloseUp by TotalPackage is a working Dressing Room addon.
(not sure it provides resizing.. but it does the rest of your requested features)
Edit: CloseUp +
FluidFrames will provide you with the exact functionality.
(you can resize the dressup frame with FF and CloseUp does the rest)
All AddOns I mentioned work on both the live + beta realms.