Chops.

There are a million directions to look at this from, there are millions of possibilities, caveats, risks, dangers, etc etc. So many things you could take into consideration, a million ways you could reason against this.

There is absolutely no way to know for certain what might come of it. It could be perfect, it could be plagued with stress, money problems and the like. A war could break out, a massive second recession could occur, any number of things could come together to break it.

However, you will never ever know if you do not take risks. If you really want to marry this girl then fucking do it and commit to making it work, not a wishy washy "we might work".

You and her are the force behind making it work, it will work as long as there is commitment to making it work, it will stop working as soon as one person loses that commitment.

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Alternatively, we could forget the sanctity of marriage for a moment and look at this outside of that (in my opinion) unnecessary nonsense and look at the now. You can have a marriage in order to simply be together, if that is what you want and what she wants. Have you tried talking to her? What does she want? Try communicating with her opposed to asking people on the internet?