Sorry, but I've got to rant just a little here.
I've seen that a ton of people who have never flashed a 6.5 ROM trying out Juicy/MM's Copper project. For most of them I think it's probably a mistake. 6.5 is still beta (actually probably alpha!) - we don't have an official RC from Microsoft
afaik. Copper is stripped down to it's bones on purpose. The idea is to start benchmarking and seeing how it all works, see what needs to be added and what doesn't, etc.
As for all the customizing - it will happen eventually. You can't seriously expect it to be all nice and easy before the OS has even been release do you? TBH - a lot of the effort people are spending on trying to figure out how Titanium works may be a little bit wasted. MS has already announced that they are going to release a new version of their old Theme Customizer. I'm sure that documentation for Titanium will be released at some point. Eventually we'll see all sorts of cool widgets being built. For now though, we just need to be patient. And if you want all the functionality of TF3d, then by all means use TF3d. It runs great on 6.5 - smooth as butter!