Yamaha DTXpress/DTXplorer/DTXtreme

Hey all, just wondering what people are doing for using a double 
bass setup w/ the DTXpress, from reading the posting and site it 
looks like making a set with the hi-hat controller as a kick is a 
decent alternative but the feel isn't as fluid as I'd like.  The 3 
options I can see would be:

   1 - Modifing standard kick tower so the striking zone is larger
   2 - By a mesh head verticle kick pad large enough for double pedal
   3 - Buying a second kick tower and link the two of them

  I'd rather not go with #3 since I wouldn't want to loose another 
input since they are fairly limited, plus I'd need to buy another 
single kick pedal (have 1 single and 1 double).  #2 would be nice but 
I'd rather do #1 for $$$ reasons, if anyone has any suggestions or 
plans let me know, if the striking pad could be turned sideways it 
may be large enough but I haven't looked at it enough to see what can 
be done yet.

  Thanks!

Shawn