Hey no worries, I was brought up with both imperial and metric, so know them equally well.
What I was heading to was an idea of using a braced prop inside the cabin, with an arm sticking out one side with a fluid tripod head mounted on to it. A simple contstruction of 3x2 timber will do it. No need to drill holes

, just have two uprights, and spread them apart overlapping each other and fix them with 'G' clamps or something across the overlap. Another clamp could hold the stick out arm, so you can re-position it as necessary.
I think we are at the stage where you need to actually try some of this stuff to show what has value and what doesn't, I guess trying to direct a camera at something 1,500 feet away is going to be a challenge under any circumstances, but by having a go you'll at least know if your are heading in the right direction.