1:57 PM, Sunday December 17th 2023
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That's fine, as it's simply another application of the same concept. Technically you could even do two orthographic plans for that same pair of dimensions, one for the middle and one for the side, if you felt it was beneficial.
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Yes, the orthographic plan is not really restricted in terms of how you can approach it and what tools you can use for it.
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Same as point 2.
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I don't have any suggestions for this, but do make sure that whatever for you're using for references ultimately provides you with a high resolution image to work from. Screenshots tend to be limited in that capacity (although if you're playing in 4k that's plenty - just don't use screenshots from something 1080p. 1440p can be okay but of course you'd want the car to take up all that space. For this reason it's generally safer to work with high resolution photography when possible as it doesn't risk losing information in the translation - though you can certainly combine different sources of reference.