First off, thanks for the compliments! One thing to note, if you are shorter than me, you could easily get this below the 2 ounce mark by cutting a few inches off the bottom...
Now, to answer some questions...
Patrick: Your coffin comment is too true. My buddies came by the shop and were like "You're building a coffin?!"
Newton: To enter and exit the bivy, one must perform my patented move known as the Inverted Reverse Worm. At 33 years old, I am just barely able to do it. A few more years and you'll see a zipper on this bivy. :)
Ziff House: The M50 only comes in the orange color right now. I know that the M90 used to come in other colors but last time I checked there were only a couple of options. I grabbed it from thru-hiker so it would be best to check with him.
Devin: Always shave your head before hiking. ;)
Tim: HAHA, Sadly, you are correct. :) It was yet another trip to mom's house for some sewing and a home cooked meal. She is so funny. I called her up the day before and asked "Can you sew the top on my bivy tomorrow" and she answers "Sure, are you going with a cuben fiber bottom again?", and I'm like "Yeah, but I have a lighter version of the momentum that we used before"...she almost 70 and a straight up UL gangster. ;)
Alexander: I remember when you posted that bivy on the forums. Great design and it turned out really nice. 4.1 oz ain't bad though, I mean, it's only 97% heavier than mine. ;)
I'll let you guys know how it works out for me, but we are getting hammered with snow up north and I don't think this bivy will make it out for a trip until spring next year, but we'll see.