The photo at the top of this page is Skiff Youth Bed #1 that we built for our grandson. She is 7' overall, and like it's two littlest cousins, her plan is drawn full size on 20# blueline paper. She's a straightforward flat bottom (non-rockered) bottom skiff, and cute as the dickens. Of course kids will eventually have to graduate to a larger and sadly more conventional bed, but unless you plan to store it away for the next little one in line, all is not lost. Remove the mattress platform, install a couple of seats, some rowlocks, and your kid now has her very first rowing boat–and that will last them several more years. That's a lot of pleasure for a small investment.
This photo is of our daughter teaching her son how to row what had been his Skiff Youth Bed. Same hull, repainted with seats and thole pins added. He's 13 now and still uses his little skiff.
The plans include full size patterns–including her planks. Never built a boat before? Why wouldn't this be a great way to start? What you learn while building this boat applies to others as well, and Littlest Boats can guide you.