Eric,
Others have answered your current questions well, but I notice you appear to have left a lot of excess wood under the lock where the trigger will go. Since that is your next step (or would be for me, anyway), it is a good time to look at it and make adjustments. Since the wrist starts to work its way down before the tail of the lock (where the sear is located, you have a lot more room in there than you might think. I just did one, for example, where the wood under the lock looked scary thin, but when I got to inletting the triggers, they had more than ample room to function and can go a bit deeper if necessary. I took pictures last night, but on my "new" phone, so you'll probably be done by the time I could figure out how to extract them, but I thought I would at least mention it for you to look at!