Yamaha DTXpress/DTXplorer/DTXtreme

I'm considering building one of the tennis ball isolation platforms 
( http://www.dtxpressions.com/platform/ ) but space is an issue for 
me.  In order to move freely around the room where my kit is I move 
the throne away when not playing.  If I had a platform that was big 
enough to accommodate both kit and throne I'd be falling over it all 
the time! :-)

Therefore, I wondered if it is really necessary to have the stool 
isolated from the floor.  It's certainly got enough height 
adjustment to be able to rise up a tennis ball's worth.  Any 
thoughts?

Also, has anyone actually built such a platform (stool on or off!)?

Chris