Using Bitmap as to align precisely to geometry formation

I have a uniquely shaped 2d geometry that I want to panel using a bitmap as the attractor. I have created a bitmap using the bounding box borders of the surface to be paneled. I used the bounding box curves of the geometry to drive the X & Y size of the bitmap…but the alignment is still not correct. What resolution does the bitmap need to be to map correctly and scale 1:1 to the geometry I wish to panel.
It would be nice if PT incorporated a preview of the bitmap to the desired surface. I can only see the result referencing the grid point movements.