Thank you !
I try to cleanly make the two gills under the nose.
The gills are etched with a small tool that is a metal rod filed to become flat. I used a metal template, the most difficult is to engrave the bow to the correct position. I started by drilling a 0.3mm hole at the end of the arches. Then we engrave, then we start again because the arcs are not aligned etc. etc.
In the photo I deposited melted plastic chips in the tamiya glue to correct the width of the arches and their shapes.
The bottom of the fuselage is pierced. It is necessary to made a clean cut and with a form simple to reproduce (not at all like me) to be able to stick in the hole the pierced plate of the gills. I put on the edge of the hole wedges that carry the plate.
The plate is too deep in sticky hence the need to putty. It was not planned. One of the two slots remains to be sanded on the photo.