You're assuming things that you lacking the context to condemn them. The hole dimension could be (IMO, probably is) the 1/4" dimension. The first page of the build manual could have a diagram which explains the convention in the drawings are done, it might not be standard, but as long as it's consistent and this and any similar drawing are full scale, there's nothing wrong with it. If these things are true, there is zero searching for dimensions elsewhere in the plans, everything you need is there. Everything I am stating could easily be wrong, too, but I find that unlikely, we don't have the rest of the plans, or even know what aircraft it is for, so let's get some more information before condemning them. Kirlbylee, what aircraft is this for? Do you have the full plans and build manual, or are you just evaluating a scan of a page or two?