Cut a slot in the hull and make a casing at least half as high is the gunwales the cut a piece of plywood as your centreboard te tou can slide it in or out as you want.
If that takes up too much space then make two side keels on either side of the hull and secure then in place to a fixture on the hull with screws so you can take them off for transporting.
Phil Rose
April 2009
If you remove the centre board what kind of keel are you going to replace it with? Remember that it stops the boat from sliding across the water as you are making sailing manouevres. If I was going to do it I would probably cut it as short as possible near the floor and fill what remains with a tiny dummy "centre board" glued in with epoxy glue and flushed off on the bottom of the boat.
Teejaytoo
September 2008
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix yachts.