Hi Alex, there are some little tiny pieces in a few areas:





There are also a few areas where ends don't meet up quite exactly. I've tuned this up in the attached 3DM file by moving the ending control points so the pieces are all trued up. With the attached file you should be able to make a network on each 4 sided area.

This will not make a very smooth result though, particularly at the internal points where 6 edges are coming out from a single point.

Your best bet may be something like make one surface out of something like this:




Then trim off the corners of that and do blends down to the "foot" areas.

- Michael