Thanks for the comments guys! I took my new kit to the range and am very happy. The bow if anything is quieter with the quiver there to dampen vibration, it didn't affect my shooting, except to maybe improve it (I still suck), and doesn't make the weight of the bow unwieldy, but I AM used to carrying 7 lbs of steel for a hunting weapon. I shot the bow with the quiver both full and then empty. I thought there might be too much flopping or even bow slapping without arrows to stiffen the two pieces, but again it was a non-issue.
Here's a few pictures of one of the pieces. They're the same except opposite. I forgot to put a ruler in the shots, but the rough dimensions are 2" at the narrowest part, and about 6-61/2" long. Just wing it, that's what I did. The arrow grabbing holes are made with 3 cuts of an exacto blade, 1st an X, then cut out the back of the arrow-holding triangle. The other half of the X facilitates loading of the arrows, like a funnel. You'll notice that I thinned the leather for the bow attachment. The center strap is totally thinned, and on either side of the strap it's thinned in a taper, but on the opposite side of the leather. I did this because the leather is about 1/4" thick, and would have been difficult to fit nicely over the bow limb. Make sure you plan the thinning so that the smooth side of the leather faces the direction you want it to. I faced the smooth side up.
There's definitely room for tweaking the design, but I don't have any suggestions as to what to change or how. I'm interested in any improvements anybody might come up with.