There are some real goodies among aftermarket products that will lift your model to the next level.
Here are but a few, and the list will become longer in due time.
ProperPlane – Absolutely terrific wooden propellers. The also have beautiful wood decalsheets, metal
exhaust pipes, rubber wheels, resin parts, etc
Aviattic – number one in decal sheets such as clear doped linen in different colours. The also have taylor made decals for different models, figures and resin models.
HGV models – Known for their fantastic seatbelts, but they have a variety of other products as well.
Yahu Models – the maker of the most gorgeous little instruments, dials as well as metal frames.
It is advisable though, to first make sure the instruments will fit in your model, if different than theirs