You don't suppose part C23 ought to be shaped? The many cuts seem to imply that.
The instructions seem to say something about shaping, a drop of water, and mounting on the cowling according to the photos of the model or the real thing.
Trouble is I haven't found any photos of either the model or the full-size that show the underside of the cowling. But there is one photo of the model showing a bulge resembling part C23 on the top of the cowling, slightly off-center. And I found one full-size which shows the same thing. (Source:
Dalotel DM-165)
In that case I suppose the white area of part C23 is meant to be kept while shaping, then cut clean. Might be a good way of shaping parts like these!
But I don't know what to do with the area where you glued the part. Something obviously is meant to be done with it after final assembly. Perhaps cutting out an opening?
Leif
PS. For those interested, see
Philippe Rennesson's photos of the build. Those really interested can
download the model here (including instructions & parts list in French).