Very nice first shot at a wood stove. I think you'll find it will perform admirably.
As far as the light from the top or bottom, it's really a preference call. Though I will suggest you read the entries about wood-gas stoves at www.imrisk.com if you want to do the top-light batch-load process.
I'd suggest starting playing with your stove by lighting from the bottom (this is the traditional hobo stove way). Pay with it, see if it works.
Basically, the pros and cons of the two methods:
Wood-Gas: Burns Cleaner, Harder to Light / build, batch operation (pack it with fuel and light it off)
Hobo-Stove: Easier to light / build, burns sootier (most of the time), 'normal' operation (feed twigs as it burns)
Making the raised floor removable is good. The idea behind the tinder, though, I've found the best way is to put the tinder under the floor and stil use the floor to hold the fuel (aka twigs) above the tinder while it burns.
You probably will find that you need a little more ventilation through your floor. You may not, but I'm betting you will want a few more hole (btw, what you did with reusing a piece of metal / tin and punching a bunch of holes in it, I've done before. It works fine for both type of operation. I just think you're going to need a few more holes)
However, having said all that... Do you have a concrete porch or a driveway where you live? If so, get outside get a few handfuls of twigs and light that bad boy off! The best way to tweak these wood designs is to play with a few real fast.