Yes, we've been through this before. "Not enough controls!" Well, this one would just be for building, which would not require many controls. Events and such could be accessed by a mode changer button that could cause taps to act like wrench, hammer or wand hits. Of course, non-default things might have to be added after transferring the build to the computer via SD card.
By the way, I posted this using my DSi. :P