I've converted a couple of floor toms to bass drums quite easily. You can buy a pair of 60's Ludwig spurs (or repro Danmar spurs) and they would fit into 2 of the 3 floor tom leg mounts. The 3rd mount will sit on top and could be used as a cymbal stand with an L arm. You can buy some maple hoops, claws and rods of your choice and if you so desired, throw on a Gibraltar bass drum riser on the batter side (mine was necessary since it was a 16" floor tom). For the batter head, I would use a Remo Powerstroke 3 and a coated Ambassador with felt strip on the reso side. I went so far as to add a consolette rail to mine and a hoop-mount clamp with L arm for the ride cymbal.
Here is a pic of one of them.
[IMG]http://i1130.photobucket.com/albums/m530/ElMoonlightDrummer/MIJ%20Micro%20Kit/2011-08-16094526-resize.jpg[/IMG]