Cary,
I should't really guess the answers to your first two questions.
Please read the following quote from the Nacra Europe web site and draw your own conclusions.
"Construction
The Nacra Infusion is the only production catamaran that is made with infusion technology. This technique makes sure that weigh distribution in manufacture produces a much stiffer hull compared to conventional methods, and stiffness of hull produces extra performance in high level racing for many more years."

Essentially instead of wetting the cloth out by hand where both resin/fabric mix and quantity of air trapped in the layup depends on the skill of the laminator. The hull or component is layed up dry. A light weight fabric is included in the layup to act as a transport medium and a vacuum is applied.

The resin is mixed in a container and tubes from the container enter the layup at preset distances. Once the vacuum is confirmed without leaks the taps in the tubes are openned and the resin is drawn from the container into the layup. You can see the resin migrate through the laup. As each section completes saturation the taps are turned off and the vacuum can be held until cure.
There are many advantages other than the quality of the end product. Not having to touch the resin means a lot of the human error component is taken out of the equation and with that goes things like wastage. A by product is a process that is also better for the environment with reduces gas emissions.

Hope that helps.

Regards,
Phill