Winter Planning - Where to Start Seedlings

I really hadn't thought about the fact that I would need a good place to start seedlings indoors. Then Sheldon died. Sheldon was my daughter's land turtle, and he left behind a huge critter cage. The tank already has under tank heaters, which will help as the seeds germinate.

You can see the two black rectangles affixed to the bottom of the tank...those are the heaters.

I've also got a few light fixtures that will need new fluorescent bulbs, and a way to suspend them 3" from the seedlings. I considered laying the lights on top of the screen, as you see in the photos below, and then building some kind of platform to raise the seedlings closer to the light source, but the screen, surprisingly filters out quite a bit of light. Seedlings need a lot of light, so I'll need to figure out a light stand or suspension bracket or something.

I've also got this little digital thermometer gadget, which might come in handy!

So, it seems I might have a pretty good place to start my seedlings after all! I'll obviously be spending some time this winter trying to figure out all of the modifications to the tank, but I've got lots of good stuff to start with!