What to with the "daisy panel" area may depend what kind of look your going for. Some ideas would be a convertible boot. See if you can get any parts from the AMT '50 Ford convertible. They should be close and the kit had the options of a down top boot, an up convertible top, and a Carson type top for a chopped version. Depending on what you are planning for the windshield area, that same kit has both a stock height and a chopped top windshields in it. You could also create your own "fabric" cover for the rear area. Depending on the era you may be trying to build too, in the late '50's and early '60's it was common to see a fabric cover that would cover that area and even come up to the back of the front seat. Hope that gives you something to consider.