Now I'm working on an improved and more compact portable PSU enclosure over what I made 6 months ago. But it looks like this design doesn't quite have enough room for the USB PD trigger board, and I'm also remembering that the output noise leaves something to be desired so I'm wanting to add some additional capacitance. It's already got 1000uF though, so substantially increasing that capacitance is going to be bulky. Maybe it just needs some low-ESR capacitance with a film cap or two, I'll do some testing.

I've planned a 100W 5S 3000mAh LiFePO4 26650 power-bank with one of those alibay power-bank modules, which will need a model for 3D printing and worst-case scenario will need to suck like 8A out of the cells, which I don't feel very comfortable doing with these battery contacts: >>2939846. But I can test that with my power supply and see how hot they get while I mess about with capacitance.