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It’s also much smaller. The main problem will be that the people sitting outside experience a lot of vertical motion when the aircraft rolls. That’s only a problem with the full scale design.

Another one I'm familiar with: https://www.verheesengineering.com/d2-twoseater/

Please lookup the flight envelope, cruise fuel utilization, and stall characteristics of the Dyke Delta along with its cargo capacity.

Then you'll understand why so many Cessna 172s were built.

It wasn't more fuel efficient than the standard plane? Was it because of the propeller up front?

It was more fuel efficient only over a very narrow band of the entire flight envelope. Also, it suffered from snap-stalls and very poor stall recovery due to its delta wing.

This is, primarily, why you only see delta wings used in super-sonic aircraft where these limitations are more than made-up for its ability to go trans-sonic with (relative) thrust efficiency.