Pic heavy updates with OSB and lumber ran, along with bringing in 65ish tons of sand.
I ordered in some 4x10 sheets of OSB from Menards. Since the poles were every 5 feet there was no cutting. Ran a chalk line and then put them up. Took about 2 hours to do the entire building. The end walls (west and east) are spaced 6 foot between poles. Still have some final screws to put in to get them all to lay flat, some of them look bowed out, but they are older pics and don't have screws in throughout yet.
On the west end we ran the OSB, along with 2x12s. This is where we tie the horses. I drilled some holes and used some big Eyebolts with some large washers on the back. I reinforced the 2x12s with some "L" brackets that are attached directly to the poles and 2x12s.
2 weeks ago we had some sand delivered, right around 65 tons. I leveled as good as I could with the skid steer, but there is some spots that are 5 inches to 6 inches and some that are 2-3 inches. The wife rides the horses nightly, so I level a little here and a little there. The last pic is from one load of sand and somewhat leveled.
On the east end of the riding area I am in the process of getting holes drilled for poles, getting the equipment storage area and riding area separated. Making an endwall with some gates in the middle. After some bickering back and forth, I ended up "receiving" a 60 wide, by 30 foot deep area for my tractor, skidder and pickup. I'll take it as a win.