I had previously thought that there was no hope of sussing out the operations nescessary to wrangle a square grid down onto an axonometric plane.
As it turns out, with help from a very straightforward little tutorial I found (http://ahninniah.blogspot.ca/2013/04...-inkscape.html), the solution was in fact very simple to deduce.
The secret ingredient was the very precise scale transform step - profuse thanks to Olga Bikmullina for simply giving the answer.
Something a little different has caught my fancy, but it's not necessarily tangential to the project:
( this here is a teaser )
( hint: it's a 48 x 48 )
Creating a custom coordinate grid can consume alot of time if a noob isn't careful.
..I threw caution to the winds.
I also improved my understanding of the scale of the map.
Here is the 33 x 33 World grid. Embark sites cannot overlap the borders of this grid (but wordgen sites can, and flaunt it ). Not even with cheats, afaik.
If you zoom in to the top left and squint, you'll see the 16 x 16 Region