I received approval from the house budget and finance committee this weekend.
I can fund the project from my monthly cash allowance
My wife and I will go to Costco in August so if they have them in stock I will purchase a new car canopy. I will sell the fabric cover on Craigslist for $125 which means the frame will cost $145. Not bad for 10ft by 20ft.
I already have the clear plastic cover left over from the 100ft roll I purchased last year so only a few odds and ends to buy to complete the project, maybe $100 more.
Here is the building site. The access from the current greenhouse has already been preplanned so new one will butt up against the opening.
I will have to move the plant tables which contain Bromeliad, African Lilies, ornamental pineapples and two benches of Amorphophallus (Voodoo Lilies).
I will post progress reports and hopefully by September be ready to house 8 inch hanging pots filled with the cuttings I took late last year and this February.

Wow! That is awesome. So happy for you.

Mike, great idea on using the canopy! How will you connect the clear plastic to the canopy frame?

Terri, I zip tie 2 x 3 lumber to the vertical frame (four on each side) and then nail horizontal 2 x 3 lumber along the sides. I don't need to take the plastic all the way to the ground. When the plastic comes down the side I wrap it around lengths of 1 x 2 inch lumber and then nail it to the 2 x 3. Hope that makes sense.
I"ll try and post pics as construction takes place.

Thanks Mike, I understand what you mean.
I have an old harbor freight greenhouse frame, not too many panels left and I can't stand the thought of replacing all those missing panels. We put the original ones in with lots of silicone and clips, and I was trying to figure out how I could just use clear plastic.

Thank you very much for telling me about using the wood! I could not for the life of me figure out how to do it. Now I just have to figure out where to get the plastic and what size and thickness- what do you use?

Terri,
I use 6 mm clear plastic sheet. Comes in 100ft by 20ft rolls. Check out your local building supply stores. If you don't need that much then you might have to go to a store that will cut pieces to your requirement. Can get expensive.

Professional nursery stores recommend UV blocking plastic but its expensive and my plants grow OK.

Of course I don't have to worry about weight of snow or high winds so you might need something thicker than 6mm.

Would be nice to see pics.

Measured the 10 x 20 ft area yesterday and put in marker posts. Have started removing plants from the benches, repotting or relocating where necessary. That 8ft post with the hanging pots at the open end of the greenhouse will butt right up against a clumping bamboo. I will need to relandscape the entire area.
All being well tomorrow I will purchase the 8 concrete blocks that help secure the greenhouse metal post to the ground.

I was googling epi greenhouses and found this older post. I'll add what I rigged up. My shade canopy which I used for potting, was ripped to shreds within a season and I was left with this 10'x10' frame. I put metal electrical conduit poles through the slats to hang pots on. In a few weeks I will add some 30% shade cloth attached with zip ties. I also added the poles using zip ties to hang them in the actual greenhouses. I bought a lot of aporophyllum cuttings this spring, so I'm short on space. This helped and costs only a few dollars each pole and ten bucks for a big bag of zip ties.

Good job! Nice and neat and clean. Mine is still standing with nice Epi blooms being produced this year.