aLL i CAN TEL YOU ABOUT THIS PLANE IS THAT IT IS A GREAT PLAN. wITH ITS FULLY SYMMETRIAL AIRFOIL. Sorry about the caps.I have flown both the forty size and the 60 size versions. Of course the 60 size flies better. I would recommend going with the size asked for. Knocking a wing rib off I believe wont help. were talking weight and drag here. You would have to make up the weight of a 60 as comared to a 40 and therefore the plane beomes heavier....which isnt always bad but can make it more unforgiven. SO to recap, if the wing is still fully symmetrical, I would call it the same plan. Go with the 60 size motor or get the 40 size plans and start from scratch there. Hopefully this helps.