Dutch 123,
There is a very easy and inexpensive means of making a flush hatch for the vee-berth storage. Lots of boat builders have used this method over the years. I removed the foam from the bow of my 25 and installed regular hatches because I thought it was a cleaner way of doing it but looking back at the expense and having to lift cushions up high enough to raise the hatches I would probably have done it the "old school" way.
Cut any size hatch hole you want in the vee berth deck and then install a support shelf, from the bottom, around the perimeter of your hatch hole. Use screws from the bottom, just long enough that they don't break through the vee berth deck. The support shelf should be about 1/2" smaller than the hole to provide good support for the hatch sitting on top. The hatch itself will be a piece of plywood the same thickness as the vee berth deck, with a finger hole to allow an easy means of removing it. If you are careful and make straight cuts, the piece you remove from the deck will make a perfect fitting hatch, just add the finger hole. It will take a bit of upside down drilling and driving screws but with a 12x24 hatch there should be enough room.
All of my earlier sail boats used this type of hatch under the vee berth cushions, if I haven't explained it clearly enough a trip to a marina or boat dealer and a peek in the cabin under a cushion should show you what I am talking about. I used a DeWalt saber saw and it did a good job, but I went through half a dozen blades, the glass really ate them up.
Rich