To expand upon this, the kids create a matching book with a picture of their structure (and their written description complete with labels,etc). You could also use a story telling app--creating a digital book to document and write about their work.
separate doc panels for each center so we can see the progression throughout the year. I also made copies of each page and put them in individual student portfolios so that I have individual documentation too!
Portfolios- Children's project work is documented throughout the year. They can self-select among the many photos we take during the year, put them in, and the teachers can write what the children self-reflect about the experience and their learning.