I'm thinking of starting a simple ultralight build. I enjoy building projects like this. I have always wanted to fly and hope to get my license sometime. I stumbled across a guy flying an ultralight online and began researching them but I had a few questions so I thought I'd ask them here. Cost is definitely an issue and i am going for a very simple design. If it'snot absolutely necessary I don't plan on spending extra time and money putting it on such as an in closed cockpit. II'm basically wanting a more recreational aircraft for short flights around my land just for fun and the joy of building it. 1. What are the best materials to use? I was thinking of using mostly metal but I'm concerned about weight I want this to be FAR 103 legal. I will be welding all of the joints and had thought about going all aluminum, but i dont have a real tig welder i just have a scratch start tig so aluminum would be a bit more complicated. I would prefer to use mild steel if possible. I was wandering what the minimum gauge tubing I should use would be? 2. What material should I use to cover the wings? 3. Is there any simple plans I could get or purchase that would help me understand the staring and elevator cables and such? I believe I can effectively design the overall frame and wings I'm still just a little confused on all of the flaps and controls. ( I'm still researching) 4.I'm planning on putting putting a 13 hp gas engine from harbor freight or something similar on this craft will this be sufficient? 5. What safety measures should I take. I will not be flying this until I'm %100 sure I'll be safe. thanks for any help ya'll can give.