You may want to buy yourself external frame backpacks, and with good reason. They have come a long way from the old style hiking backpacks that had those rickety external frames, the ones that were set one the outside, on the sides of the pack.
Although steel structures began popping up in the early 20th century, the largest surge in steel building construction occurred during World War II when airplane hangars made out of steel were constructed for the military.
Here's a detailed package for the do-it-yourself individual who likes to keep busy by doing things. It's the MyShedPlans Woodwork Package which is full of in depth plans. There are countless plans that are simple for any professional to use.