i used plans from classic arcade cabinets as a base to build several galaga stand-up cabinets and about 150 some odd pacman cocktail cabinets.
i feel without having actually designed the file and having it setup for your particular machine and your particular toolings available, the plans with all the dadoes and stuff are borderline useless, as you need to seperate all that stuff out in your software to do the proper passes so you don't screw up your material. most of the shops out here don't use vcarve and choose deal almost exclusively in straight DXF since it's 99% of the way to a tool path without to much messing around. and without the extra data of how deep the passes need to be for the dadoes, Having a file with a bunch of random lines and since you didn't design it, you don't know if it's supposed to be cut inside this line? or outside this line? or is this line supposed to be a filled toolpath for a dado... is just too much farting around to try and get it to work... nah.
but, it is good as a base though, gets you your pieces the right size and the appropriate shapes at least. i ended up deleting most of the extra crap and keeping the sizes and shapes. I inform my guy if any lines need to be cut on the inside of the line or not. (for button/speaker/power cord hole cutouts etc.) i can deal with making slots and stuff with a router or saw later if need be, but most of the time i don't even need to since i build to assemble without them.
so in conclusion, 5/10... it's there...but not there... and as you can tell by your question about the dadoes and stuff... since you didn't design it, it still requires quite a fair bit of farting around and finessing to make it work.