1. I'm not sure, but someone definitely will.
2. That's really a matter of personal opinion. Try whoopies and see if you like them.
3. I'm also not sure, but somebody will be able to help you with that.
Finally, I noticed you tied a back up knot for your cinch buckles. With those cinch buckles, a backup is no longer required, and in fact, I am pretty sure it is discouraged. Something about damaging the webbing I think. I realize this post may not have been very helpful, but I just thought I would toss in my 2 cents.
EDIT: Oh, and with the MacCat, I am pretty sure you don't need a continuous ridgeline. You can have a line coming from either end. And for ease of use, instead of tying all those knots for your tarp, you can look into getting some tarp flyz from Dutch. They really cut down on the setup time and they weigh next to nothing. Plus they are made out of titanium, which is just cool.