As a result of the ever decreasing space in my bedroom, I had to downsize my drum set. The Floor tom was converted to a kick drum using some 10mm steel round stock and some 40mm Pine I had lying around.
This conversion is completely reversible.
After a bit of experimentation, I found that the tom-kick sounds best without a resonant head, and to mic the batter head from inside. Use a pillow to deaden the batter head.