Hi Jannath, thank you for sharing your plan so far. It is really useful to see how others are going about using FOSIL. Your booklet looks like it will be full of some really useful teaching and learning. If you could share it, it would be great to see how you set this out.
As far as the construct stage goes you do not need to teach the whole cycle, just focus on construct. It will depend on how long you have to teach this but I would start by encouraging them to talk about what they have learnt and understood about the topic they have just studied. What can they teach you or their peers about the topic? They already have all the information they need they now just need to pull the important information together to demonstrate their learning. This page is a good one to start with, although I am sure you have already found this… I would also be using this resource… Main points from my own research found here… and this one about drawing conclusions.
I am sure others will be along to give you some more ideas but do keep us informed about what you plan going forward and how the sessions went.