The hammock type is up to you, but all are a bit challenging to get in and out of.
We have used a hammock (the cocoon type that envelopes you) on our 30 Catalina. First and foremost make sure everything on the hammock is intact, no rot, no fraying at the ends, etc. Same applies to all securing lines. Do not use any bungee!
At one end (head) you can attach the line(s) to the hammock and to the mast just above the boom with a bowline, hitches, whatever.....On the other end you have to use the forestay (furled headsail in my case) and the spinnaker halyard. You can use a towel or something to minimize chafing of the line on the headsail if you desire. This line (I use a number of hitches here) just keeps the hammock stretched out and steady while the halyard takes the weight and gives you the height you want at you feet. Hook the halyard up first and use another line to attach to the forestay (bowline to secure hitches to adjust).
Its much like the set up we use on the windscoop for the forward hatch. Once again make sure everything is secure and in good shape. Test with a daring heavy crew member! A fall would drop you on the forward hatch and that would not be good!
A hammock on the foredeck is wonderful and very relaxing.:dance:
Enjoy
Bob
Georgia