I built a new Survival Endless Plan myself. Those who recommended a plan, you better hurry and find a way to give me the layout. I can't give out my e-mail publicly, but at least post it on your user page.
Anyway, I will post a picture of my new plan later.
Update: The plan crashed, it fell apart before I could take a screenshot. Requirements for a new plan are reduced.
No Gatling Peas, Torchwoods, or Magnet-shrooms are nessecary. Tall-nuts are, though.
Read the previous post for requirements.
Update: I got the photo! And I made it to 40 flags. The game with 40 flags in progress still lives. The reason why I wanted a new plan is so I can get to 40 flags to get the achievement "Alive and Planting" on my 360.
Here's the photo of my new plan:
Update: Made it to 50 flags recently. New record!