Teardrop with tent pop up

Hello everyone, I've been lurking for a while but just joined to ask opinions on my pop up design.
I like tent camping but my teenage daughters don't like sleeping in bear country (most of Alaska) separated by only a thin sheet of nylon between them and the wild so I thought an aluminum-sided teardrop with a screen-sided section of pop up roof may be a decent compromise. On the (rare) warm evening I can keep the top up and the mosquitos out. When my daughters take it out they can batton down the top to keep a psycological barrior between them and the local wildlife. I think I looked at most of the pop up threads on this forum and I didn't see anything like my proposed design. It is simple enough, in addition to the usual galley kitchen in the rear a similar hatch system and huricane hinge is used to make a popup facing the tow vehicle.
I envision something that is about 5' by 10' that is a little over 5 ft tall when closed for road travel. I kept the height down to make it easier to load bikes and/or kayaks on the trailer roof. Oh, by the way, why don't I see many teardrop designs with roof racks?
I look forward to your comments and ideas, Jeff