Turbo,
You WILL need the speed brake on the roo! Trying to land the roo can be a difficult task at best until you learn the proper way to slow this aircraft down. Without a speedbrake it will be nearly impossible on the runway length you have to work with. The roo will tend to hop (thus the name Kangaroo) if you carry too much speed into the landing. The trick to the roo is to have 90 deg of speedbrake deployment, transition to slow flight in the pattern then hold the plane 12" off the deck till it settles itself in. I would not even attempt to fly your roo until a speedbake has been installed!
Just my 411 flights worth
Todd