Not any different than how anyone else works with kit parts and creates digital versions. Lots of folks are doing this. When I do mine though, it's the effort to make it look like a 40, 50, 60-year old model kit part that makes a final difference. Of course when a supervisor or 'expert' sees it they think the part isn't sharp enough... :eyeroll:
These'll slot into place just fine, but depending on how prominent they are might seem 'off'... though if using printed parts inst of real kit parts, I doubt the intended audience will care.
They need to adjust their costs though. For some of what they offer, they want you to buy 6-8 parts for the price of a kit.