Good job Luc!
Labelling is definitely the hardest part! I’ve never been totally satisfied with my home made rigs with regards to the lettering.
Water slip decals seemed to be a good idea but I hate the fact that you can see the edge of the transfers.
I’ve had reasonable success with Letraset rub on transfers but it very hard to maintain even spacing between letters and keep to a straight line.
This was a home brew RockMite that I labelled with rub on transfers -
The method that I’m currently using is vinyl stickers. The stickers are intended for model boats, you can by them in sheets in different colours and sizes. There are still drawbacks though, it’s difficult not to stretch the stickers as you remove them from the backing material.
At the end of the day, who sees these rigs anyway? I think the important part is that the rigs work and the function of each control is obvious enough that you can use it without guessing!
Good luck with the QCX, it’s a rig that I’d like to try some day.