The seed tray has worked out very well for me. My attempts with using uncovered cups did not. I purchased another 25 spot tray, with a package of refills.
The beans and corn quickly grew to three times the height of the cover and I had to remove them. Also, I didn't keep careful record of it and now I don't know which beans are Cranberry and which are the Blackeyed.
I drew more detailed versions of each garden plot so now I have a better idea of how many seeds to plant. It appears that I might have some room for broccoli. Looking over the layout, I'm going to have a busy season.