EM9EROR

Hello everyone! 

Well, I'm soon to be the proud owner of an Evo 3 but I have some questions that I can't find answers to so I'm hoping I can find them here. So here goes my questions. 

The option code on the vin plaque says "0U0" and while I came across a thread that states all the option code for an Evo 3 it doesn't include this one. anyone have an idea of what the options are for this code?

I've seen threads that say Evo 3 tranny gear can be swapped into a 2G DSM, but can a 2G DSM tranny be swapped into an Evo 3? Asking this because when the Evo 3 tranny goes (hopefully it doesn't) can this be a solution?

How worried should I be about finding parts? its 2024 so this car is 27 years old! (I'm scared of the damn roof rust problem)

I plan to see how it does as a daily, think it's a good idea? (I have another car btw)

Lastly, How much power can I make reliably without killing the trans? Ive seen that anything less than 400whp is good. Is that true?

Also, anything else I need to know about these cars?