Custom Truck Camper

I'm still not completed with my finishing touches on the Mobile Mango, but a new idea has entered my noggin. I'm having thoughts of building a truck camper for my '13 F-150. I've been thinking of the construction, and I think an economical approach would be to use a truck rack like this as the foundation. For an initial cost of $260, that sounds great.
This would allow me to sandwich rigid foam between the metal uprights, and skin the exterior and interior with 1/4 and 1/8 plywood. I would like a child bed on the extension over the cab, and I could either build a platform that rests on the wheel wells to allow for some shallow bottom storage, or build upright cabinets in front and behind the wells. I don't think I can incorporate a kitchen with this design, but might be able to create some sort of chuckwagon box.
This would allow me and my son to go camping with relative ease and at a moments notice. My wife has started a new job, and while she now only works 3 days a week, it is Friday-Sunday. Ugh.
Do you think this would be a good starting point?
This would allow me to sandwich rigid foam between the metal uprights, and skin the exterior and interior with 1/4 and 1/8 plywood. I would like a child bed on the extension over the cab, and I could either build a platform that rests on the wheel wells to allow for some shallow bottom storage, or build upright cabinets in front and behind the wells. I don't think I can incorporate a kitchen with this design, but might be able to create some sort of chuckwagon box.
This would allow me and my son to go camping with relative ease and at a moments notice. My wife has started a new job, and while she now only works 3 days a week, it is Friday-Sunday. Ugh.

Do you think this would be a good starting point?