popup camper box as foamie base ?

For those of you that have built a Foamie. I've been looking at popup campers on craigslist. I've been wondering if you could use the base box/shell/body from a popup. And attach the foam onto the upper ledge of the box ? Not planning to use the popup top/roof, just the box and frame. Hey it's just a question. Im sure that scrapping the box would make a better starting point. But if possible, it could create a good plan/ maybe not! I've ideas that were worse than this that have worked
. But doing this may be more trouble that what it worth. Let me know what you think. I can take it!








