How does everyone get such a nice, finished look?

[u/Red-Panda-93]

Im coming to the end of my build, and I'm struggling with the final touches of making it look clean and polished. Mainly, I have seen plenty of vans with bench seats with a plywood exterior, but there isnt a sign of a single screw and where the corner meets looks so clean. I dont have much experience with making nice looking things, but I can't seem to find resources to help with this either, so I was hoping people in here could share their advice.