If your logical and factual then you don't judge it by it's feasibility. You rather take known facts and problems and try to resolve them logical - to make it better. To learn from it. It's an opportunity.

Burji (highest building) was also doomed by kings and horses. Learned a lot. Next will be even higher.

Budget talking is not my point. This somehow will be overcome. If not, it's not my problem. There are ways for getting money. You know it, I know it.

Maintenance and transportation can't be judged right now, as we didn't see it in function. You and I don't know anything about the plans.

You're speculating it will be shitty, I speculate it's possible. If you use modules. Do we have experience with modular buildings? (Yes we have..) Can we use this made experiences? (Yes..)

So you see problems before they're actually emerged. That's foresee of the future. All the debunks will be wrong if the line proves the opposite. I see the same problems as you do, but I don't think their unovercomeable..

They have a lot of rocks there. The sands are because of the weathering of the rocks. And they have a lot of sun. Which would make grounding of rocks feasible. That could allow them to use desert sand too. Or they might find a mix between traditional and desert sand.. and some special ingredients. who knows!

if you never try, you won't find it out.

It's a way of creative problem solving. If they build it. In the "middle of", suddenly, something is not enough, then you do have to find a solution.