Crossing the Other World to Build Gundam

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction. He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world. How would he use the Gundam that Long Fei created? What waves can be caused in this different world?