Well, the roller frame is built to fit under it without being seen. Since there's no overhang I'd have to somehow connect it to the underside of the roller frame in a way that's secure enough to hold the weight of the cabinet.
I figure that the lid will overhang the cabinet so that it's weight doesn't need to be supported. Kind of like what jester did here:
I wonder about the dissipation thing too. I figure there will need to be a gap of some sort on all sides to allow air flow. and I've seen images of people having fans in there and all manner of crazy stuff. Just not sure how it will all connect or be powered
I'm LEANING towards trying to secure a couple 2x4s to the bottom of the roller frame, parallel to the front, in such a way that I could secure the side planks to it. But that could be problematic. And since it's already got 2 gas tanks and 3 kegs in it getting the thing on and off and back on the roller frame is a chore to say the least.