Very few kits use custom parts, and if they are mass produced (usually are after being in a kit) you can get them for decent pricing after. Colour replacements usually don’t cost more, but using a bunch of 1x2s to replace 1x12s will make a weaker product that costs more since those 6 pieces cost more.
And if you have those parts, in reality, you’ve already spent the money and just right there that makes it more expensive anyways.
Very few kits use custom parts, and if they are mass produced (usually are after being in a kit) you can get them for decent pricing after. Colour replacements usually don’t cost more, but using a bunch of 1x2s to replace 1x12s will make a weaker product that costs more since those 6 pieces cost more.
And if you have those parts, in reality, you’ve already spent the money and just right there that makes it more expensive anyways.