Actually some of us are angry that such a poorly designed wing could be offered as a plan for other people to build from. You need to understand that people have been killed by model aircraft of this size, and a wing failure could be dangerous to innocent people.
The structure of model aircraft is a delicate balance between many factors including strength, stiffness and lightness. Designing an RC model requires knowledge and experience. The photographs of the model so far suggests that the 'designer' has no idea of the proper way to design a structure that will be safe to fly. Forget this design entirely and build and fly a few simpler models designed by a reputable designer before you even think about designing your own plane , let alone offering your plan to other people.

For reference, one of England's most experienced designers decided that his 56inch Extra 300S needed an OS .70 Surpass or similar and even the 42 inch span version needed a .40, so this alone shows how far this design differs from one that has flown well. (note. I am not saying that these engine sizes are 'written in stone' but this is what has proved to work well on this type of scale model)