I love this topic. One thing I have noticed over the years, is that quite a few modelers assume that what the kit manufacturers put in that box is an accurate representation of the real thing. Nothing is further from the truth IMHO. There are allowances made for tooling, as some angles of the real car make it impossible to remove the thing out of the mould. I take a lot of time doing reasearch on the real subject, and I also take a lot of time test fitting, and "massaging" the bodies on my builds (removing mould lines, deepening door and trunk lines, block sanding the model before and after priming, etc. (Thank you Darin Bastado for showing the work you are putting into that Firebirsd!!!)
Most modelers do not research the model they are building against the real thing, therefore unless it is a full custom, a junker, or heavilly modified race car, unless they do a lot of prep work, their efforts will be passed over in the contest world.
Gloss paint used in the interior of a car is quite silly to me, unless it is a race car where the real one used a gloss finish in places. Bad paint jobs often hurt one's chances of winning anything in the contest world.
I once judged a contest where the modeler, clear coated the colored plastic on the model with a heavy coat of clear, represented an "up" convertible top with masking tape, painted gloss black, and used Testors Silver to represent the chrome on the car, over the kit's moulded in hardtop. He was quite proud of his effort, as his friends told him that his model was the most accurate rendition of the subject they have ever seen as a model. The modeler who built this "gem" was not a child, but a full grown adult.
On the other hand I saw a built up model with NO exterior paint, just the polished out plastic, and Bare Metaled detail painted and decaled, and let me tell ya, it was beautiful.
We all have various skill levels, and I compensate for my declining skills by just taking my time. I do not profess myself to be the best modeler here on the board, but I know a well built model when I see it, and I am happy to offer my assistance to any modeler who needs it.