Another Flying Boat that I have built from Airfix was the Sunderland. It took a lot of fettling, and scratch work, to upgrade the 50 year old kit, but the bones were good.
So once I had added metal barrels, a scratch interior, and a snappy paint job, it was reborn. All 10 videos are now in a YouTube Show list. The link only works in a browser, so may fail in an App.
https://www.youtube.com/show/VLPLNv64WC6Itdzjp7OucJOc0KM74QJIRzAI?sbp=QAE%3D