Wow! that drawing was NOT in my 29.5 manual and I never saw one.....
It looks similar the 216 retractable sprit - but I doubt the parts are available for the 29.5 so you'll have to make your own - but the 29.5 sails great with the tack attached to a block on the anchor roller, so you really don't need the sprit.
Take this with a grain of salt - this is the setup for the 216 sprit:
the 216 kit has a fixed tube attached to the foredeck and a carbon fiber pole that slides inside. the aft end of the pole is attached to the aft end of the tube with a bungee cord to retract the sprit. the aft end of the pole has a line attached that runs forward to a block on the forward end of the tube and then aft to a camcleat in the cockpit. pulling this line extends the pole. The spinnaker guy runs thru the pole and comes out at the forward end to control the tack. you raise the spinnaker from the cockpit, then pull the tack forward to the pole with the guy. you could make something similar, but make sure you don't block the anchor locker. Most aftermarket sprit kits are made to be removable for just this reason.