Are the door "upcatch" brackets really neccessary? Building a model 4 and my directions obscurely located the requirement to drill the holes before covering and I missed it. I already covered the wings and while I think they could still be installed with a little work I'm wondering if it's really neccessary to have them. I figured I would just make the door open up to where when the strut bottoms out it's just below the wing. Thoughts?