This is a story idea for a Naruto\Ironman xover. I might write it myself someday but at present I've far to much to do to write a fanfic. Now on with the plotbunny.
The plot starts out with Tony Stark being in a major battle with multiple enemies one of which pulls back from the fight for a moment to open a doorway to the Naruto world. Tony is mortally wounded by the other villins combined attacks. When he arrives he has just enough strength life to save Naruto from the villagers and somehow transfers all his knowledge to Naruto. After Tony's death Naruto swears to find a way to travel back and forth to Tony's world and his own so he can stop the villins who killed Tony and so he can take Tony's body, which has been frozen or somehow been preserved, back to his friends and family. Later Naruto builds his own version of the Ironman suit and much more.
The story needs to take place before Naruto goes to the Academy. Everything Naruto builds needs to have some sort of Ninja twist to it, in other words no nukes or rockets, but small missile like weapons that can be invisible and silent will be fine. Also Naruto should build somethings that all the village can use and things for the other ninja in the village. One thing Naruto must learn from Tony's knowledge is that anything he makes for others to use bust have a way that Naruto can stop it from working and or destory it if anyone in the village goes rogue or betrays the village somehow. Maybe even have Naruto improve village security with some tech of some kind.
I'd suggest having Naruto's first project be some kind of large village wide power system that won't be affected by chakra or need chakra to recharge it, that is better then the system they already have. Well that is all I've got. I hope to see some stories from this soon. Just add in where you got the idea from. Bye now.