On the subject of neck sizes/profiles, kits will usually come with a fair bit of wood to the neck so you can sand them down to the size and profile you like. You don’t have to be aggressive and attack the neck with a rasp, I find spending some time with some 80 grit sandpaper is usually enough to sand the neck how I like it. I suppose if you like a V profile you may need to use some more serious tools, but to get a comfortable C profile doesn’t generally take too much work.