Thanks, everyone, for the insight.
In response to a few good questions:
I avoid crating Fawkes during both the day and evening. I'm employed as a writer, and so I'm typically able to spend the day with him, in which case I crate him during the evening.
If, for some reason, I'm unable to accommodate him during the day and he must be crated, he sleeps with me at night.
Incidentally, I took Fawkes to the vet last evening–he needed some shots to booster his vaccinations. I had the foresight to record on my cellphone a few videos of Fawkes's behavior in the crate. My vet, an excellent fellow, provided much insight. Among other points of interest, he suggested that Fawkes's crate may be too large. Luckily, the crate I purchased is adjustable. I decreased the size this morning and left him alone until lunch. Characteristically, he didn't respond happily, but when I returned for lunch, he hadn't urinated for the first time in a few weeks! Great news.
I'm prepared for a slow process. These crate issues notwithstanding, Fawkes is an impeccably well behaved fellow--especially for a puppy.
Thanks again, everybody, for the kind attention.
My best to everyone and their Basenji pals.