It's weird, but I often seem to stumble across a thread where someone is cutting their teeth on their first knife right about the time I'm hitting a wall of some kind in the shop and it always reinvigorates me via the memories of why I decided to do this for a living.
Thanks so much for sharing your adventure with us, especially accompanied by the great photo-documentation.
First off, are you having a blast? Can you hardly wait 'til that blade comes back from Peters? Are you already thinking about your next 3 knives? Chances are you've been bitten sir!
You show a whole lot of natural ability and common sense, not only in your actions and what you've turned out thus far, but in the questions you ask. I think the lines of that knife you have out for HT are pretty sweet.
You've already been given a ton of great advice and input. All I can add is this:
There is rarely such thing as a "Scrap Knife", there are just smaller knives.

If you stick around, you'll read that bit of advice thrown around quite often, and for good reason.
If I were you, I'd revisit that pattern you decided to scrap because the lines weren't "speaking" to you at the moment. I don't know how deeply you filed with that rat tail, but if there's enough thickness left in the spine when you file out the flats, you could still salvage that blank. I'd say there's a pretty sweet little neck knife living inside that "scrapped" blank.
I realize you stated that you're a fan of the convex grind, but are you familiar with draw filing? If not, check out this video -
http://www.youtube.com/watch?v=Dec78RQsokw
Even if you want your final profile to be convex, draw filing is a great way to remove a whole lot of material really fast and accurately if you're working without a belt grinder, or a really long blade/sword.
In the video it's being demonstrated on the flats of an octagonal rifle barrel, but all the important aspects involved are highlighted and directly transferable to the flat of a knife bevel. Best of all, the materials needed are all available at your corner hardware store.
Anyway, just wanted to pass on the kindness I've received here by welcoming you to the knifemaker brotherhood and give you a little virtual "atta boy" on your progress thus far.:thumbup:
I'm far from knowing it all, but if I can help in any way, let me know,
Taylor