To mark the centerline, set a compass to span something more than half the width of the leg. Draw an arc from corner of the leg. The point where the arcs intersect will be on the centerline. With a centerline point on each end of the leg, place a scribe on the point, slide a straightedge up to touch the scribe. Do the same on the other end. When you have the straightedge positioned so that you can touch both points with the scribe, and in each case it is touching the straightedge - without moving the straightedge - scribe the line. Use scribes, rather than pencils or pens, because they make more precise marks.

I built my first platform bed by following the steps mentioned in the tutorial and the end result was everything I expected. It was as beautiful as comfortable and strong. It only cost me around $60 to build this one from the scratch. And if I can build it, anyone can. What you need is a little bit of woodworking experience and a lot of confidence. Collect the items as suggested in the video and start working now.
1. You mention doing other hobbies which I assume means stuff scattered around for various projects. (Don't tell me you do one at a time or are a neat freak!!!) How tall are the side walls to the shed? How high do you shuffle stuff around, i.e. flipping things over, moving wood around, etc? I can't imagine trying to do that in my shed, even if it were 2 ft higher than it's 7 ft center height. If you could build a platform in front it may help, especially if you can put removable cover over it (to please HOA).
I ended up making a number of practice cuts. The first revealed that I hadn't tightened the screws on the edge guide enough. The second revealed that the design of the edge guide provided very little support at the end of a board, because of the cut-out for the router bit. In the "Getting Started in Woodworking" video, they had screwed a piece of hardwood to the edge-guide, to provide a continuous -- and longer -- bearing surface. I may do that myself, some day, but I didn't have the materials at hand, so I clamped some 2x4 scrap to the end of each board, to provide a continuous bearing surface past the ends. The two grooves in the long stretchers and the side groove in the short stretchers have identical layout. I made practice cuts in scrap until I had the edge guide set correctly, then I cut them all with that one setting. The bottom groove of the short stretchers uses a different setup, so it was back to the scrap, before cutting them.
Working with reclaimed wood is a savvy use of resources, and the material's country appeal is undeniable. With just a saw and a small drill, you can reuse old fencing to make these simple woodworking projects: picket-inspired picture frames. Finish them off by hot-gluing clothespins or bulldog clips to hang your prints. Here’s a step-by-step guide.

Students who are interested in woodworking, either as a career or a hobby, can find classes through certificate and vocational degree programs. Furniture making and opportunities for wood sculpture can also be found at schools that offer studio art programs. In California, a wide range of programs in the field are available, including individuals classes as well as formal educational programs. While degree programs include general education programs, all woodworking programs focus primarily on the development of hands-on skills with respect to safety measures.

The top is supported by the top ends of the legs and the top sides of the top stretchers. Stand your legs on end on a flat surface (like my door) and see if they wobble. If you have an end that isn't quite stable, use it as a foot, where the leveler will make it's flaws unimportant. Check the top edge of each stretcher for straightness. If one has a bit of a bow, use it for a lower stretcher. It's less critical that the shelf be well supported along its length.
After I left the magazine for a new job, I did all of my woodworking in my small two-car garage, but it was a struggle. Power, lighting, and temperature control were limited. And because I shared space with our cars I was always moving machines around, often while in the middle of a project. On top of that, my tool and machine collection had long since eclipsed the space. For all these reasons, fixing up the garage wasn’t an option. My finished basement is a family room, so it was out, too. An addition to the home or a stand-alone building would have been too expensive. I had to find a better path to a shop.