First, you should move this to mining speculation as your requesting opinions. You can move the topic using the button by scrolling down to the bottom left.

I'm wondering what you mean about a source of free unlimited Natural Gas, to power the generator. Someone must be paying for it, but that's for you to handle. Just make sure that if there is a chance you will be footing the bill on this that you are prepared.

As far as machines go, you should still consider going with a more efficient model. This will allow you to put more machines online, thus increasing your mined BTC. I like the 841's - they are efficient, reliable, and are backed by a 2 year warranty. Being from the US, you can order from Blokforge.

The property 8 hours away - Is it secure and out of the way? Can you get a reliable internet source there?