$200 for Poor mans 4'x8' "greenhouse" hybrid.

So im looking to build a lil shelter for my plants this year to house some lights and protect against fall weather.
This will not have sides since I want as much as air flow as possible, just a frame and a roof. Additional stakes will be needed but i can cut down bamboo and i'm sure most of you can too. This design will give coverage for most of two large plants. Whatya think? Better to just buy an inexpensive green house and cut the sides off?

8 x 4 Feet Crop Cage Plant Protection Tent with two 4x4 cold frames on top ( someone has to have those cheaper)

Final height 11 feet or 132 inches tall

You grow cannabis outdoors proper and your plants will exceed 4' diameter, and that tent is just 4' wide...why you want that thing anyway?

I covered my outdoor buds for the first time this year and the bag appeal was a million times better.
Plants will certainly have a larger diameter than 4' but it will cover a good amount if not more than half the footprint of the canopy.

What did you come up with?
There has to be a decent DIY solution

I am using the crop cage ATM, haven't decided what I will do for fall yet.

Pvc pipe, bootstrap farmer clips, good greenhouse plastic and 6 pieces of rebar for stakes.