Alot depends on the temperatures you require and the size of your mold. Maintaining uniform temperature across the mold is key. Ovens or heat tents work best. I wouldn't advise using carbon fiber unless you really need to. CompositePro is right, there are issues with getting power safely to...
Try Lord Corporation,
http://www.lord.com/Default.aspx?alias=www.lord.com/adhesives
Those guys have always been helpful to me in the past. They have adhesives especially suited to you application.
That's tricky and will depend on what vacuum level you are drawing to. You have permability of the fabric, off gassing of materials, and other factors. Also as the level of vacuum increases it becomes more and more difficult to move the air molecules. A vacuum pump manufacturer such as...
I thought you wanted to keep the cost down? S-glass may be double, but I don't think 6 times the price. But either way you are adding costs.
Anyway, decreasing thickness will decrease your section and make for a less stiff sandwich, all other things being equal. Strength should be the same...