I use tarp huts here in Oklahoma for the pasture horses. They work great, have to replace the tarps ever 2 or 3 years because of sun damage mostly. The horses love them and do use them. You could also use them to cover your Round Bales as the horses can eat from both sides--you would just need 4 "T" posts.
I usually place mine in a corner so that I only have to use a couple of "T" posts with a 16" cattle panel.
I put one end of the cattle panel in the corner of the lot, against the fence and use those ZIP ties to secure it to the field fence and either hay twine or wire to secure it to the larger corner post. Then I set my two "T" post out from the about 8-10 feet. place the other end of the cattle panel inside those posts and secure the panel to the post--make about a 6 to 8 foot tall arch--you can make the distance between the corner and "T" post longer and lower the arch height of the shelter.
I use 2 6x10 tarps as they seem to work better for me. I align the long side of the tarp flush with the edge of the cattle panel and secure the rings to the panel using ZIP ties. I put the short edge of the tarp 1 square off the ground as that allows air to circulate at ground level and secure the tarp with the ZIP ties. I then double back the excess into the under side of the cattle panel and secure it with Zip ties. Doing this allows you to overlap the tarps at the top by several inches and I always have the top tarp facing opposite way that most of our winds come from.
I also use a couple of hay bale twines to go from one edge of the cattle panel to the other (the 52" width) at the top were the two tarps overlap as this helps keep the tarps down in high winds (we have 60-75 MPH winds during bad storms) and they have never ripped.
IF YOU WANT TO ENCLOSE AND END DO THIS FIRST, so that your tarps over the top of the frame help keep the rain/snow out.
If you need to enclose one end I then add a third tarp (measure your opening and use the best size for the opening. Again using Zip ties, align the tarp and secure along the edge of the cattle panel and then fold your ends up tight against the frame and secure--you will have to do some nip and tuck (folding) to get it tight, them do your sides. I personally don't cover the ends of mine this allows for good air flow.
Mine have withstood very high winds--65mph, heavy snow loads--as the snow slides off except for the very top and I just go brush it off with a broom.
What is so nice about this you can make the length of your hut as long as you want by adding additional cattle panels side by side.
The cost of 1 hut--1 16" cattle panel, 2 or 4 "T" posts (I make use of fence corner posts) and 2 tarps is less than $30 each. I always have lots of ZIP ties on hand so did not figure the cost in here. Here the 6 x 8 tarps are less than $4.00/each, cattle panels are about $14/each, and "T" post are about $3.00 each.
If anyone wants photos I'll try and go get detailed photos of the ones I have up and send to you.