So what became of the zucchini?
I bow to JoelF's definition of
enormous and Geo's
suggestion for prep. I mostly used the proffered
recipe as a guide.
Some variations. I used 3/4 lbs of lamb instead of beef. I browned half and stewed the other half with uncooked brown rice, the tomato juice from a drained 28 oz can and garlic crushed in a mortar and pestle along with salt. An hour more or less. OSalt and pepper to taste. I combined the two pans in a bowl (after draining a bit of lamb fat). Make sure this is tasty because your flavor will come from the filling rather than the zucchini. I refrigerated the filling and even have a bit left over. This was quite tasty.
Next day.
I cut and scooped the zuke:

The recipe called for soaking the now naked zucchinis in a mild brine for 15 minutes. I salted mine instead (no bowl quite this size) before rinsing and patting dry.
I lined the felled giants with a bit more rice and the sauce:

Instead of ghee, I dotted with butter (per a suggestion from the lone comment on the Epicurous recipe)

Baked at 400 for 40 minutes or so. It was mostly done, but the zucchini was still a little firm to my taste. I turned off the oven, put the tray back in and ran an errand.
2 hours later:

All in all, it was quite tasty. I think a fitting fate for such a large squash. Granted, it didn't really feature the zucchini. Maybe I'll buy another one and grill as suggested.
Stay tuned for the next episode of Enormous Produce Iron Chef.