Ha! Made it!
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I'm still playing with positioning, and have ordered capacitors to refresh the crossovers, but as they sit I'm pretty happy.
Some initial impressions and comparisons from last night and this morning:
The Sevens present a larger sound image than the TW3, and have deeper and more physical bass. The conventional drivers are more dynamic than my Magnepans - lots of punch! The imaging is very stable and clear and deeply layered.
I suspect they will sound better with some tweaks to positioning and new electrolytics, and I may get more objective as I listen to them more, but right now I've got no regrets about picking these up.