This gazebo is very similar to no. 2. On this, I haven’t made any separate inner floor. The corner posts goes through the base and are glued on the underside. I don’t know if you think this is trickier than the others but I wanted to try this.
I have added some pictures as it is a slightly different design. Use the assembly instructions on Gazebo no.2 for the rest.
You can find the file here.