Yamaha DTXpress/DTXplorer/DTXtreme

Hello,

I'm new to this group and I'm thinking about getting the Yamaha 
DTXpress, it seems to be the best bang for the dollar out there and I 
am bit of a Yamaha fan.  I currently own a 5-piece Yamaha Stage 
Custom accoustic jazz kit, a Yamaha dual-chain double bass pedal, and 
a Yamaha sound system for my computer, and I must say, I'm very 
please with all my Yamaha products and that is why I would like to go 
with the DTX.  The questions I have are as follows:

1. Will my double bass pedal work on the kick pad?  It looks rather 
small in the pictures I've seen, but is there any way to rig it up to 
accomodate a double pedal?

2. Is there an easy way ( a secure way I should say) to rig up the 
pads inside my stage custom kit?  As in, removing the heads and 
fastening the pads inside the shells.

3. Is there any problem with the kick/hihat pedals sliding on the 
floor?

4. Does anyone know of a page devoted to making pads?  A friend of 
mine said you can make them out of practise pads and a few cheap 
electronics from Radio Shack.  I would also like to know where to 
find the DTXpression page that I have heard about (where to download 
custom kits and such).

5. Most importantly, what is the cheapest price you people have 
found/paid for a DTX?  Is there any places online I could find a used 
DTX in good condition?  What do you people think about buying a used 
DTX?  

Sorry about being so longwinded, but this is a big investment for me, 
so any help would be greatly appreciated.  Thanks!

-Josh Schroeder