I always end up picturing the borrow words as being similar to how Firefly handled it, with smatterings of the other major languages (primarily spanish and chinese) thrown in, but with grammar yeah, I have no damn clue.

I don't know enough languages personally to fudge it. English has a very distinct grammar style and sentence structure thats different to say Chinese or Japanese. And I'm assuming different than a lot of Euro languages it was based off of too.