Cuddy hatch

My DSII has a vinyl hatch cover that I want to replace with a wooden hatch. I can make the hatch in my shop and I have already read where to get the gasket material. I am having trouble finding some type of latch to keep the hatch in place. What should I use and how many will it take? I have considered attaching a bungy to the center of the hatch and then to the mast.
Mike Hastings (hastinml-at-co.forsyth.nc.us)
Mike Hastings (hastinml-at-co.forsyth.nc.us)