if you're single handed and going to fly the chute, I would leave the jib completely off the boat. However, if you had roller furling, it would give you more flexibility in different wind conditions.

You will loose the ability to adjust the luff tension from the water with a roller furling sail unless you do something fairly controversial (it can be done). Most guys with roller furling adjust their luff tension on the hard and leave it.

Your forestay will need to be shorter. I would order a new one so you still have the old one if you wanted to go back for any reason. The Nacra forestay will work just as it is if you shorten the bottom end of it. Install the upper swivel between the mast hound and the forestay. Simply measure the distance between pin holes on the roller drum and the swivel and subtract that from the overall forestay length. You will need to get a little creative with how you cleat the jib halyard. Some have a plastic cleat sewen into the tack of the jib. I'm in the process of adding roller furling to my 6.0NA and I think I'm going to setup a small pulley that will clip to the end of the halyard. The clew will attach to the chain plate with a pin like on other boats. A line will tie to the end of the halyard, then through the roller part of a jam cleat w/ roller attached just above the furling drum, to the pulley on the halyard, and will lock back in on the jam cleat. That will give 3:1 purchase on the luff tension and hopefully be enough.