The prior post was referring to US gallons, not Imperial

Wasn’t 1938 the year Packard used a decal instead of a metal number plate? It is rare for these to have survived.
Packard had an assembly plant in Canada where many of the RHD models destined for Commonwealth countries were made to take advantage of more favorable export laws

The canvas top is a bit visually jarring to me

Fantastic job!

Sorry, I was unclear. I was talking about the pre-war one. How did you make your own?

ABS is OK for this, but there are many different grades. You trade off heat deflection temperature and impact resistance. Choose appropriately

ABS is not really dash skin material. It’s alloyed with flexible vinyl to improve the processing of the soft skin in thermoforming

Bravo for adding to the parts available! Any thoughts for doing the early AC vent?

The gloss will not automatically be the same between the new and old panel. But a good painter can formulate the paint to equalize it. Most black paint used just carbon black, but if the hue needs to be adjusted that can be done too

“Testing the waters” and “trade for a running vehicle”

I have a running push mower I ‘ll trade for the Frankenstein pile of parts

Only Argentine carrossiers I can think are Francone and Argentierie.

Have you looked for a coach builder’s plate on lower cowl or door sills? If it were modified when new there should be something

Most of these are flexible vinyl. Beware that solvents that can go in at ambient temperatures can come out at ambient temperatures. The stuff you used is likely to interfere with adhesive so make sure you do sew the pad on