Inspired by the discussions in this thread here (link) I thought I'd post up an idea I had.
A while back, while wandering into town, I started wondering what a 40k table 'in real life' would look like. They're generally 4'x6' (that is about 1.2m x 1.8m) and 40k is (roughly) at a scale of somewhere in the 1:75-1:60 bracket (if anyone wants to argue this, I'm quite prepeared to show my working-out). That's close enough for me to 1:72 which makes working in Imperial absolutely fine - 1" = 6' (72") and I'm happy with that.
After I got home I started playing about with googlemaps and nabbed the following:

The red line marks out the approximate size of a 40k table - 96 yards x 144 yards (about 88m x 130m), around a central crossroads that I figured I'd try to build the terrain around. I'm calling the directions of the roads north, south, east and west, even though it's closer to north-west, south-east, north-east and south-west.

In Streetview, the area looks like this (all shots from the approximate point that the 'table edge' intersects with the roads):




And the schematic I came up with as a plan looks like this:

I have simplified some aspects of the terrain, and I'm ignoring other parts, but pretty much what I'm figuring to build is on this map, with two exceptions: the small part of a multi-story building in the bottom right (south-east corner) labelled '14' is too difficult to get to work (it's only a tiny part of a massive X-shaped building that can be seen in the first plan and satellite image) so I'm ignoring it; and the two buildings connected by a bridge in the south-west corner ('6' and '7' in my schematic) will be set square to each other, and the road (instead of being on two completely different alignments).
I'm thinking of trying to build a series of mostly falt-roofed elements that can by configured to create this location, but can also be re-arranged to build other not-so-real environments.
So... do-able? Or have I bitten off more than I can chew here?