The first fillets are done. Applying the epoxy with a “pastry bag” (zip-lock sandwich bags with a corner cut off) works very well. I made a filleting tool out of a stainless steel paint scraper by cutting it into shape with a pair of snips and sanding the radius smooth. The radius needs to be increased somewhat so that the fillets become a little bit bigger. The existing fillets will be fine, but they definitely shouldn’t be any smaller than that. All fillets within the cabin that are visible will be coloured with wood flour to make them a bit less conspicuous.