Bryce Texturing Question

When I make a texture for the ship to use in Bryce what size (proportions) should it be? If I have a ship1000 Bryce unitys long do I have to make a 1000 pixels large texture. I'm going throught various tutorials on texturing DXF in Bryce and it seems to me that everyone suggests the size proportions of 1:1 or about 1:1.2. What do you think?

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