Tetrahedrane Properties and Analogs

I took a look into some [tetrahedrane](https://en.wikipedia.org/wiki/Tetrahedrane) ($\ce{C4H4}$) analogs, platonic hydrocarbon, basically very strained tetrahedral geometry at every carbon. I was wondering what will be the predicted delta H of formation for the tetra nitro analog tetranitrotetrahedrane? What will be the predicted detonation velocity too? Could there be modified analogs that are even more energetic?


