The actual construction of the shed floor went pretty quickly, but it took me a couple of weekends to get all the supplies. In fact, I bought all the 2x6's and cut them on one weekend. I didn't get to do the plywood subflooring until the following weekend, though.
Here's a photo of the finished floor joist assemblies. Since the 2x6's were already cut, it only took me a day to nail all of them together. Each floor pad is attached to its rails with a series of brackets. They are lined up on the string line and are just about as in line with one another as they can be. The extra 2x6 blocking that you see you the lowest pad is there because I want to get the best yield from the subflooring plywood. The shed is only five feet deep so that leaves three foot pieces left over. The extra blocking lets me use those drop-offs.
Here's a photo of one of the pads with a cross piece still attached. I did this to keep the pad square while I moved it into place and attached it to the rails.
I also laid down some vapor barrier to minimize moisture under the shed. This is the Pacific Northwest after all.
And here are some photos of the plywood attached. I nailed all the joists together, but I used screws to attach the plywood.
Here's a photo of the middle pad so you can see the elevation change from pad to pad.
I waffled a bit about the best way to attach the joists to the rails. I chose to use brackets that restrict side to side movement as well and up and down movement. I think the connections should withstand a modest earthquake.