I would not worry about the poles blocking too much sun. Air flow has to be good so plants will not mold or “cook” the plants if they get too hot. On the far side of the my frame there is a set of double doors. I can drive my tiny tractor with a bucket in and out. This allows me to spread compost and clean out the house with ease. There are no center poles in my hoop house. The center poles in your design will not allow you to even use a wheelbarrow inside the frame (just food for thought).
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