A couple of thoughts on the hoop tent:

I hope the fly doesn't conform too closely to the shape of the inner tent. Otherwise, I'd be worried about condensation problems. This type of design can have ventilation issues.

And given the weight, I wouldn't expect the floor of the bathtub to stay waterproof very long. Clear your sites carefully, and put something underneath to lessen abrasion (groundsheet, footprint, or even trash bags).

On the plus side, you can use the inner tent with a grounsheet underneath and a tarp pitched over top, and have a shelter that's quite light and versatile, with room to do more than just sleep.