Wanted to jump in sooner, but too busy having a Merry Christmas. 'Hope everyone else had a good one too!
My Mystere 6.0 came with a rear tramp pocket. For an illustration of the pocket, go check out the tramp layout pictures at the Sunrise Yacht web site. First click on
http://www.multihullnets.com/ then click the enter button, then click on "beach cat store." Then scroll down to see the Mystere 6.0 tramp.
You'll see three pockets. A halyard pocket in front. A tunnel pocket in the middle, through which the 4-way sheeting system runs. Then you see a huge rear pocket with a forward facing opening.
I would strongly recommend this style of pocket to all beach cat sailors! It is far more handy than you can imagine. Just be sure to create some rear exit holes for sand and shells.
I often wished that the halyard pocket had a rear access. I may cut a zipper into the rear end of it. That would be very nice.
I'm with Steve and others who have mentioned using folded over webbing pieces here and there on the tramp to provide tie down points. I set a couple for my spin. bag; a couple more for my anchor; a few more for other misc. stuff.
You should make these loops large enough to pass a 1" webbing buckle through. Then you can buy webbing straps that have adjustable buckles on them (REI, $3) and lash down just about anything you want to including your crew if she is threatening to jump ship.

When Bill Mattson and I do our excursions to the Channel Island National Park, we focus on safety at sea. At one point, early on, we realized that we were going about gear stowage all wrong with too much weight inside the hulls. Weight in the hulls would be difficult or impossible to remove if you were turtled, with the cargo preventing you from righting the cat! So we decided that we had to have all of our supplies on deck and quickly removable.
The cargo on the wrong side of the capsize fulcrum needs to be jettisoned at once. To deal with this, we have put our heads together to come up with a rip cord system that really works. Besides having a ripcord system, we actually have rip cord lines that can be reached by a sailor when he is in the water.
For additional safety we carry what I call "anti-turtle lines" that trail while underway. They also are reachable from the water. When capsized, they are used in preventing turtling, aid the sailor in climbing back onto the boat, and can actually be used in lieu of a more conventional righting line. I'll stop digressing here in this stowage thread, however.
The ripcord is a bright pink dynema line that is so thin that draging it in the water is no measurable power loss. It attaches to each and all of the rip cord pins, all tied (in parallel) to the end of this rip cord line. When you give it a yank, all the bags fall to the water's surface. The bags are also tethered to the boat with leashes so that they won't float too far away.

For each bag, you need to have a grommet. The rip cord pin, a third of a plastic rudder pin, lays flat on the bottom of the tramp, overlapping the grommet. A circuit loop of bunige is passed through the grommet and around the rip cord pin.
On top of the tramp, the bungie loop is large enough to pass a 1" webbing strap. That webbing straps takes the following cirucuit:
Webbing buckle set near the bungie loop,
over gear bag, through a (webbing) tie down point on tramp,
back over bag, through bungie loop,
over bag again to a second tie down point,
back to and through the bungie loop and through the adjustmet side of the buckle set.
Now you can set the tension with the adjustment buckle. You can remove the bag with or without pulling out the rip cord.
If the grommet is large enough to pass two folded bungies through, then you can have two bags on one rip cord pin.
These rip cord grommets need to be at a place where you can reach them from the top of the tramp. You will need that if you are ever reloading the system after use. Also, there needs to be a tether line from the rip cords to the boat (dolph. strkr. rod) so that you won't loose them when they are pulled out.
Hope it makes sense!

My two grommets on on my forward cargo tramp. Suggestions: You can use the righting line grommet that Nacras and Prindles have, if you just pass your righting line over the cross bar instead of through the grommet.
GARY