Giver'sLog all over Pinterest. I had a 3 year old girl on my Christmas list who I knew would love something like this. I changed a few things while making the fabric mailbox because I didn't want to actually go out and purchase anything, I wanted to only use what I had in my fabric collection and craft supplies. (I tend to do that a lot.)
So instead of plastic canvas I used interfacing and quilt batting. I only used fabric where she used felt. I didn't have magnets so instead I used velcro. I omitted the fabric wire, I found the opening looked good without it. And to complete the flag I made a hole using my scrapbooking grommet maker and attached it with a brass paper fastener.
I cut scrapbook paper to 4x6 inches and added a sticker to the upper right corner so that it appears to be a postcard.
Keep in mind when you see tutorials online that you don't have to do it exactly as they have instructed. Sometimes you might find a short cut or by omitting something the end result is better. Allow your own creativity to flow. Be inspired by others and allow that to flow through your work.