By all accounts the Dr would probably be in better shape if the kidnappers weren’t able to contact their family.
Fusion, on the other hand, requires you to get center-of-sun temperatures and pressures going on to work properly. That usually requires either extremely difficult engineering processes or a fission bomb (and more precise engineering calculations but they're actually reasonably solvable).
* I am eliding over the fact that building a Farnsworth fusor is still a challenge, but less of a challenge than sourcing, purifying, and enriching uranium certainly.
* "The first is called Map of the Founding of Tetepilco, and is a pictographic map which contains information regarding the foundation of San Andrés Tetepilco ...": San Andrés Tetepilco must have been Spanish, of course.
* "The second, the Inventory of the Church of San Andrés Tetepilco ...": Churches would be Spanish.
* "Tira of San Andrés Tetepilco, is a pictographic history ... comprising historical information regarding the Tenochtitlan polity from its foundation to the year 1603.": At least it seems to be about Aztecs.
Why were the first two books about Spanish topics but written in the local language? If Spanish people writing, wouldn't they write in Spanish? If Aztecs were writing, why would they care to record these things? I suppose the latter is plausible if they were absorbed into Spanish society.
None of the early designs seemed to have any brakes, making them quite impractical.
Without modern steel and machined parts, a bicycle of wood and iron would simply be too heavy.
The real world only has pain and suffering. Endless trials and never a payout.
Games on the other hand and very detailed and have a well defined path to success.