@Lars, yes, that is for the presentation. Since our schedules do not allow us to attend this workshop, we have notified the GF Challenge Team. I think the write-up is for the final prizes, not only for presentation. And I think the final (overall and category-related) prizes will be based on the latest standing (including the last IFP) as indicated by other posts from GF Challenge Team.
Once final results have been calculated, winners will be contacted for further information regarding their specific methods. They will submit this information in the form of the final write-up document and will have 10 days to complete their document from the time they were contacted regarding the final standings of the competition.