3d printed M3 bumper

I decided to take the project on of 3d printing my own m3 bumper and slapping it on my early model 318i. Quickly found out AFTER printing and assembling all pieces that the m3 is 50mm wider on each side😭😭 so my bumper was sticking out obnoxiously. But I said screw it we ball and am cutting the middle and just going to fill the small gap shown below with fiberglass. AND DONT WORRY I’m fiberglassing the inside to strengthen it and then carbon fibering the outside. Keep in mind I am 17 and literally do not have enough money to afford a new bumper but I do have enough to do projects like this and I’d rather learn and mess up than drop $700