I don't know if I understood your question right, but I think you want to get the request from the servlet addapt to a resource and then you can adapt the resource to your model. If the that is the question you could make that:
Resource resource = request.getResource();
Model model = resource.adaptTo(Model.class);
If you resource is compatible with the model everithing is going to work just fine, and you are going to be able to access your model infomation.
Hope I helped in some way.