That tesla tablet is most likely built up misinfo from people who didn't know what Tesla was like. I don't think he needed to be cryptic like that, he either stated his ideas in an easily comprehended form as they were or kept them in his mind. Occasionally he alluded to certain things which he'd thought about but hadn't released, but there were no riddles as far as I know.
Third pic is from Otis T. Carr's work, which used cone shapes a lot. I've looked into this and this is something which could very well be viable for multiple practical applications including space-time energy gathering and actual force thrust, but its not easy to build these devices. The operation of an OTC Saucer would be by psychotronic means, meaning that the operator of the craft would use their own energy or mind to make the craft move and not just anyone could make it work.
The wardencliff type of tower is viable but difficult to realize for the reason of it being so big and needing so much material for it to be built. If you're interested to get energy from the atmosphere, look up lasersaber's channel. There are also crystal batteries and magnet generators which can work. Thomas Henry Moray had atmospheric electricity devices which also could provide a lot of power, as seen by many witnesses. There are many unconventional ways of electric power generation, including using plants or microbes.
Making a ship capable of going to Mars, would require it to have some navigation system, life support and shielding against harmful radiation in addition to the thruster and power supply. Life support might include schumann frequency for countering outer space disorientation. Backup systems are also a concern, since space is very empty and vast.