Ok now for the not so easy part of scaling up drawings. Most of us RC aircraft CAD designers draw the RC plans at the same scale they will be built. That means the drawing shows all the proper sizes spar stock and sheet thickness being used. That said when others want to enlarge the same drawing things change on the drawing.
I know people think being drawn in a computer we designers can simply push a button and make it larger. For the most part that is true we can do that and yes the drawing will be larger. However for example the once indicated 1/4" spars will look to be nearing 3/8" and the sheet thickness for the ribs was once 3/32" now looks 3/16" and so on.
In short most of the basic parts like the fuse cross section; rib profiles (less the spar sizes notches) and bulkhead profiles will be fine and can be cut for building. You'll just need to retain the same size stick stock and sheet sizes used on the small plan. So you will need to redraw the rib notches back down to the former size not hard to do. You can't use that larger size of wood or it will be too heavy to fly so using the regular sizes of wood is usually lighter and easier to find.
I wish there was an easy fix to this problem but without a complete redraw of the enlarged plan for the new stock sizes one has to make due with what you have. I wish I had the time to draw many sizes for everyone but sadly I do not, but this is not a huge thing to work out good luck.