Huzefa S: I have worn the vapor barrier shirt with a pack. I haven't found it slippery but I've never worn it as the outer layer. I usually have a fleece vest on and a Marmot shell overtop to keep the snow and wind out. If you decide to go the silnylon route I'm not sure I would recommend it as an outer layer because of the slipperiness and it's not as durable as other fabrics but it's great as a base/middle layer.
Brett Warren: I would really recommend the Ray-Way quilt kit. It's the first thing I ever sewed. The Ray-Way quilt materials are a great compromise of cost, performance and durability. The Climashield insulation is good, however, it is heavier than you might expect. I started a thread once about the weights of the Climashield quilts vs. the Polarguard 3D quilts. Here's the link:
Theoretically, Climashield should be warmer for the same weight of Polarguard but with a smaller loft. Ray still uses the loft of an insulation as a measure of it's temperature rating so he uses a heavier Climashield to achieve the same loft. If you read the other thread you'll see my opinion of Climasgield vs. Polarguard. The Ray-Way quilts have about 7oz of insulation. Most other quilt manufacturers would give that a much higher than 40F rating. You might be surprised by the warmth of the quilt.
The nylon is pretty good. The momentum at Thru-Hiker is better but it is more expensive. The 1.1oz nylon that Ray uses is better than the 1.1oz nylon at Thru-Hiker. The Thru-Hiker 1.1oz nylon I've used is good but it's really shiny and slick. The nylon that Ray uses is fine for a quilt. I wouldn't use it for clothing if I could avoid it.
The yarn and grosgrain ribbon that comes with the kit are top quality. The real deal with the Ray Way quilts are the instructions. They are first rate and I recommend them to even the most seasoned sewers. Also, if you compare the prices, you can't beat Ray's.
If you'd like to get Polarguard 3D you can buy it at Outdoor Wilderness Fabrics (www.owfinc.com) right now. They don't make it anymore so jump on the chance if you want it.
As for the mitts, I sort of used a pattern. I started with the pattern for fleece mitts at Thru-Hiker. It took I think four tries with cheap stuff from Walmart to get the mitts right. The pattern at Thru-Hiker is way to small for insulated mitts. Every time I made a new prototype I added an inch or two to the pattern until it was almost unrecognizable. Mitts, oddly enough, are the hardest thing I've ever sewn. They are difficult to get the size right and all the sewing (most of which is far from straight) is packed into an annoyingly small space. Any slight mistake such as taking too much seam allowance can ruin the mitt. I tried to make a pair of mitts for my dad for his birthday and I couldn't do it. I don't know if I'll ever be able to make another pair of those mitts even if I wanted to.
I'm pleased with the mitts because the are really warm. They have 1.5 inches of loft on the back and .75 inches on the palms. Of course, that's been significantly compressed from use. I live in Winnipeg, Canada where it's really cold and the mitts are a God sent. I work in an outdoors store and even the best North Face and Mountain Hardware mitts aren't as warm.
Next on the agenda: my own design of winter tepee tent and winter sleeping bag. I have a North Face winter bag but I don't like current winter bag designs. I have a few ideas I'd like to try.