I found this: http://www.southdowns.eu.com/uploads/w600/813.jpg

You might be interested. Its a 3d plan of bond street, after all the
upgrade and crossrail work is done.

The glassy bits are what's there now. Slightly grey glass is the
Jubilee line, and the red is obviously the Central line.

If you look carefully, you can even see the disused lift shafts, and
their (truncated) access to the platforms.

Yellow is the station upgrade scheme. Blue is the connection to
crossrail.

The picture is a bit confusing in the middle, but note that blue is
above the Central line (red), while yellow is below the central line.

The yellow arm at the top left, is presumably just for emergency
access, as it goes from what looks like a lift/stair shaft, straight
to the escalator interchange level, not the MIP interchange level
below it (the yellow mess in the middle, under the blue).

The most interesting bit is that funnel tube going from right to left
near the bottom of the picture. It looks like the yellow bit - the new
escalator route - has to duck under it, then step up so that it can
still go over the running tunnel. My guess is that the funnel tube is
the post office railway, but that's disused and out of date, so why
have they awkwardly ducked under it, instead of just cutting through
it?

It makes much more sense than the plans in the crossrail site. Why
can't they do all their 3D plans like this, rather than in that
awkward way they do? The moorgate one is a right mess - how you get
to the northern line is indecipherable.