A simple 12' by 10' pvc hoop house frame can be constructed and covered with netting.
The materials required are;
9 lengths of 3/4" UV resistant PVC electrical tubing (from Lowes)
8 pieces of 18" long 3/8" rebar
24 nylon Tie Wraps or wire
1 roll of "Deer Netting".
For a total cost of about $45.00 for 120 Sq ft coverage compared to 16 sq ft. The "Deer Netting" is 50% of the total cost.
This is a Photo posted on the Web, the ends are not needed for a net enclosure.
1. The rebar is hammered into the ground, leaving at least 6" exposed.
2. Two lengths of tubing are connected together (has swaged end) to form a 20 foot length, and pushed over the exposed end of rebar.
3. One length is used to form the top center rib and connected with a tie wrap to each hoop.
4. The hoops are draped with the netting, which is attached with tie wraps or wire twist ties.
It can be used in summer for netting, can be draped in plastic as a season extending cold frame, and disassembled very easily for winter storage, I have used this design successfully and it is extremely sturdy.
If you do a google search for pvc hoop house plans you will find lots of plans to fabricate the frames and hoops. It could also be made with a base frame for use on a hard surface.