<< I said that about 0,0,0 because I found that if you build a ring around it you keep using it as a main reference point and in the end it gets buried under lots of geometry, if MOI had layers it would not be a problem , it was just a thought>>

As a work-around until there are layers, you could try saving your model in stages, and only importing
the parts that you need as a reference to build the next stage.

As in the tutorial I did of the signet ring, I've sometimes drawn squares off the grid, in the lower
right corner of the front viewport to use as "job boxes" to hold the various stages of a model.

That way, you have a copy of everything, so if you wanted to delete the stuff at the origin and just
work on one thing at a time, you could. It's not that hard to select a box of parts and copy it from the center of the box to the origin,
but I'll admit it takes some extra modeling discipline to actually do it. :-)

(The boxes would work for most rings and jewelry in general, however, with more complex scenes,
it might be difficult for the display to shade all the parts if you had a lot of boxes).

Another thing you can do to make it easier to work on a particular area, is to select the parts you need to look
at and then do an <invert> and <hide>, which temporarily hides the parts which are visually blocking you from doing your work.

Did someone come up with a shortcut key that does invert-hide as one task?

-Jesse