What are the dimension of the perimeter of your hoop?I will try to explain what i did to build my hoop house for everyone interested. I am sorry for the long post to everyone else.
First thing I did was to figure out the width i wanted by arching one of the panels so i knew how much head room I had inside. I think most panels at 16 feet long. I got mine at Tractor Supply for 20 bucks each. They are 50 inches tall. The overall dimension of the hoop house is really a personal preference. I used 4 panels
Here is the link to the photos https://www.backyardchickens.com/g/a/7050199/hoop-house-coop/
The Base:
4 x 6 treated timber. Cut lap joints in the corners and joined them with construction adhesive and a large bolt. I wanted it to be strong enough to be able to be pulled or lifted by a tractor if the coop needed to be moved. There is also a 4 x 6 timber across the coop at the midway point. I used large lag bolts the are installed from the outside as well as a double joist hanger(slightly modified to fit 4 x 6).
The Hoops:
The panels are nailed to the inside of the base with "U" shaped fence staples. I put a 2x4 on the ground and set the panels on that to get a consistent height and to ease with nailing them. If the panel are not even on the bottom they won't be on top either. I cut the corner of the back panels to reach over the back 4 x6 so that back wall would flush with the base. I used hog rings to tie the panels to each other and foam sill plate insulation over the joints to prevent any punctures through the tarp. The foam is a pain. The chickens destroyed it where they could.
The Door(s):
I looked at the arch of the hoops and the height of the door and compromised. Mine is 30 inches wide and 62 inches tall. Because of the arch the door height is limited, so watch your head going in. I would have liked it to wide enough for a wheel barrow but it is not bad at all.
I framed for doors on both ends just for future flexibility. The door is covered with hardware cloth.
Ridge beam and center post:
I used 2 2 x 4's as a beam to make the panels more sturdy. I didn't want my to collapse like some i saw online. I installed a center post on the 4 x 6 cross brace. It is just 2 2 x 4 screwed together. there is a ridge bean from the front door header to the center post and a beam from the center post to the rear door header. The panels are now nailed with fence staples to the top of the ridge beam.
End Walls: The walls are just 2 x4's cut to the height of the panel and fastened on top with fence staple and screwed to the bottom base. The back wall is covered with plywood and the front is covered with hardware cloth.
The Tarp:
The tarp I got is a the heavy duty silver one i bought at Menards. I think is was a 20 x 20 for around 50 dollars. I wrapped the tarp around 2 x 4's and screwed them down to the base. Same with the back except it is just screwed to the back wall. Nothing fancy and I have never had a problem with it at all except the one small hole caused by the lawn mower.
OK guys and galls i think that is it. Feel free to ask me anything about my hoop house if there is something I didn't explain well enough or i didn't get the photos you wanted.