After a few nights of unfit sleep due to paranoia regarding the shelf dimensions that I'd given to Yair and Don Roberto before I left for Scandinavia, I procured these pictures of the progress. My measuring is notoriously haphazard and sloppy (I didn't go to Montessori school as a child). I double checked with friends (thanks Jenny and Annie) and can now reclaim my well deserved siesta. The shelves are looking solid and spiffy. I suspect they will fulfill their cosmic task nicely.

Here's Don Roberto, Yair's carpenter buddy, lining up the planks for the next shelf.

Stacked up two tier shelves for Practical Life.

The dimensions for these Montessori shelves, for anyone out there with the interest are:
60cm L x 55 cm H x 25 cm W for the two tiered shelves (for the smaller Practical Life)
120 cm L x 65 cm H x 30 cm W for the three tiered shelves (for holding Number Rods and Red Rods in Math and Sensorial Area)
110 cm L x 65 cm H x 25 cm W for three tiered shelves for other general use (more Sensorial, Language, Math, and Practical Life).
And a couple of taller Practical Life shelves to hold buckets and larger trays.