Andy,
You didn't mention what would be on- and what would be off-line. Were you thinking that the 'construction' phase would be classroom-based? I am interested in ways of supporting online reflection of offline concrete experiences when there is a real reason to do so. That reason might be that small groups who have been working separately come together to share their experiences and broaden their learning, often in the telling as well as the listening.
I have used Kolb's cycle to analyse such a situation, and it helped to show up the different contributions that students could make based in part on their experiences outside the classroom.
Frances