First Time Yurt Builder - many questions

[Jafo]

I can't answer all of these questions, but will answer a couple. The rafters sit in the crotches of the lattice, on the cable, not on tip.

The lattice will sit flush to the edge of the platform, so yes, same size. Some manufacturers use a small metal bracket to attach the lattice to the platform, and I think it is wise to do so.

The wall fabric will need to fit snugly over the side of the platform so water will not run inside.