I found a website that seems like an ideal website in order to fit your needs. There are many websites to choose from, but this one seems like the best. The URL for this website is www.laspilitas.com/garden/how-to/gate.html
You can find deck gate plans on many DIY forums. People can share ideas and pictures, even plans and find the one that works right with the ideas you have.
There are several different websites that will give you free deck plans such as: deckplans.com and decks.com. You can also ask a sales representative at your local Home Depot and Lowes for deck plans.
The most simple porch decks are probablly the ones that are wooden. Those are nice and cheap. You can find your porch deck plans cheap at the home depot.
You can try looking for sled deck plans at your local Home Depot or Lowes stores. Either store would have fairly cheap deck plans for you to choose from.
There's a lot of website for this but if your cheap enough to not pay for plans it makes me wonder how cheap your going to be while building the deck. Try not to cut any corners on this project, it's worth the price.
Most architectural firms have websites where you can locate outdoor deck plans, however you will want your deck to be customized to your specific house. Also, you will want to pick out all specific materials.
There are a ton of great places to get deck design plans. If you want a customizable one that fits your personal needs then websites like hotspring.com, timbertech and bighammer offer free deck designers where you can customize and print your plans. The DIY Network also provides instructions on deck planning as well.
I know a site that offers free deck plans - deckplans.com. There's a big variety of sizes and shapes that can be found on the website so there's something for everyone.
You can find deck plans on line . I found these sites that have great deck plans. They also have boat deck plans here are the sites Shannon Deck Plans www.Shannonachts.com/shannon_deck.html and another one is Deck plans- Boat deck www.pnc.com.au/-byceme/fairsky/boatdeck.html
There is a website that is called Deck Plans. They offer plans of sample deck plans, and you can also purchase deck plans and print them off for around 20 dollars.
I would not but any cheap deck plans online as most decks need some sort of planning permision from your local council, you should allways use a local contractor unless you are suitably qualified to do the job yourslef.
I have found these websites that offer free deck plans: http://www.deckplans.com/free-deck-plans and http://www.decks.com/deck plans/ However, with it being a rooftop deck you are after, I would suggest getting a professional in to do it.