When to lay OSB floor

If I use the moisture resistant OSB floor, can I leave that exposed to rain?
 
I have now purchased a water proof membrane and planned to lay this down on the floor. It can sit there - potentially for months, without worrying about water damage as the walls and roof come up. Probably quite slowly.

I've just realised that I am going to have a couple of 15mm pipes popping out of the floor, as well as 2 40mm wate pipes. I can cut them just above the osb floor and put a join at a alter date but my main concern right now is that the holes in the membrane to let these pipes through, will also allow rain to seep through. Is there a robust way to handle this? I would hate if after all of this, I still find that the floor is wet and swelled when I remove this membrane in a few months.

Thanks again.
 

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