So a bit of a lockdown activity spurt.
First up, the kit appears to be of Amodel origin, Scalemates said so and the decal sheet has AModel on it. I suppose if you really wanted to work the parts better, you could avoid some of the more "agricultural" fit to some of the parts. Not really in the scope of this build. Although as the surface detail on the fuselage is quite good, fine engraved lines.
So sanded down the excess filler, it may have been a bit over the top and went on to clean up (within reason) the rest of the bits and got it together.
Not 100% sold on the Christmas Light top sensor housing. It might disappear
Bung on some primer to see where more attention is needed. Oh dear. Is more attention needed. There may be trade offs.