This evening, I attached the rudder spar and did some riveting. Specifically, I only did the rivets I could complete with the pneumatic squeezer, and the blind rivets.
I still need to wait until sealant/adhesive fully cures until I complete all of the bucked rivets. That probably won't happen until sometime late this week (though initial signs show that the adhesive is curing nicely).
I will probably go ahead and begin pulling the parts down for the horizontal stabilizer this afternoon. At the very least, I can begin the general deburring and prep of those parts.
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Also, I went to Walmart yesterday evening and purchased a couple of storage items to put rivets, screws, etc. in. I didn't get anything especially fancy, but it suits my needs.