The 180 requires a buck converter to knock the voltage down to 7.5v, but I've used 20v adapters with my g4 and G3s with no issues, so you could get those a bit cheaper since they just require the USB trigger board. I think the USB trigger boards are ~$3 each, the cables are a usually $3 or so each, and the iBook G3 adapter it $7 + shipping, but unfortunately the store where I got mine seems to no longer have stock.
So, for the 180, you'd have a buck converter ($2) and the USB-C trigger board ($3), and the standard power 5.5mmx.2.5mm jack ($3).
For the G4 adapter, I'd recommend a boost converter ($2) and the USB-C trigger board ($3) and a 2.5mm headphone jack for the power plug ($4)
For the G3/3400/1400, I could build you an adapter that you'd just could get one of the C11 adapters to make it work when they come back in stock, or if you have a bad charger I could try to harvest the connector from, I could wire it up. It would be the USB-trigger board ($3) and a standard 5.5mmx2.5mm jack ($3).
For the PB5xx, it would be a 15v USB-C trigger board ($3) and one of my 3d printed, custom assembled cables ($8). Note that my PB5xx adapters only power the laptop and do not charge the battery because the battery requires a separate 16v, current limited supply so I connected only the pins for powering the laptop.
That would be 4 adapters. I'd use my own printer to print the cases for $6 for all 4, but if you wanted the higher quality resin prints, that would likely run $20 for all 4.
So, with PLA, some printed cases, you'd be looking at around $40 + shipping, With the nicer resin cases, it would be $54 + shipping.
EDIT: I just checked my 20v adapter with my 17" G4 and it seems that my position of "20v is fine!" may not hold on the larger powerbooks. It did work with my 24v adapter, so I'd recommend adding $2 for the boost converter for the G4 adapter. I updated my recommendation and cost above.
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