@dcarch How many varieties of tomato are you starting? My friends think I'm crazy because I'm doing 13 kinds - this looks like more. How many plants, total? It look like you start your seeds directly in beer cups - I start (tomorrow!) in seed trays and transfer to beer cups when they have 2 sets of true leaves. Looking at your set up I'm questioning the need for the two step process.
My major problem is that, like most little boys, our half-grown kitten loves playing in the dirt. We are still discussing ways to keep him away from the seed trays and,later, the plants.