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?
It is off the beaten path, but has internet service available. As far as security goes, I have a trusted relative living in a home on the property who is going to assist with maintaining the generator as that fits his background. He can also preform other basic functions like mailing parts off for warranty or etc as needed. I plan to do all the diagnostics via accessing a remote desktop setup in the mining room. The gas is entirely free, the well has been dug for decades and mineral rights are owned by me. A few miles away is a similar property owned by a relative and she sells her gas line to a gas company that pays her $2k-$3k a month for what they pull out of it. That has been happening for decades.