Ber said..
I wouldn't know where to go to. But it sounds very interesting. I'm from the Netherlands, do you know where I should go?
For these open questions where you do not know where to start, a first pass with ChatGPT(*) is a good way to get leads, that you can then explore and feed into google searches to refine them.
You can find SUP shapers, or:
- sailboard shapers: top notch construction, but must know the type of rocker needed for SUP
- surfboard shapers: I would avoid, they do not know how to make strong and light boards with high volume. Plus the SUP rockers are different (faster)
I would of course recommend Gong, a full carbon custom with PVC sandwich on the deck was 2000 euros last year, but the type of construction can be chosen at will. I chose not the contest/ultralight construction, but one both lighter and stronger than production. Just contact them for discussion on the shape and more info.
To give you an idea, my custom weights in this construction are (they have not a paddle ding nor heel dent after 2 1/2 years of use... like new)
7'10" Alley-based 112L 5.75kg (without pad)
7'11" Karmen-based 119L 6.3kg with extra reinforcement on the rails (without pad)
I know a guy here (Hossegor) who have his SUPs made in Portugal by Wasp and is quite satisfied with them. They have an impressive range, and excellent reputation:
waspboards.com/sup/And as AlexF said, some production brands can make you custom boards, ask them.(*) E.g: