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Got the parts! Everything looks good. Started taking measurements and in-notebook sketches of layout. My plan is for the whole unit to be around 165 x 78 x 40 mm in two part housing. One part is the battery pack and BMS, batteries lined up in one row side by side. The other has the USB-PD out module (73x37) and PD-trigger for power-in. The out module also has a barrel connector for barrel 15V if desired.

The second part will be stackable, so if I ever need 2 or more things running off the same battery pack, I can add another out-only block on top, extending the long dimension.