Hello,
I have an Axis Pumpfoiling Board and I like to begin the Wing Foiling too.
What is a reasonable Custom Board?
Nearby Switzerland is e.g. Wark-Baords.. other mentioned the Flycat Custom Boards are quite good...
Kind Regards

Production board ENSIS or Indiana. Custom swiss board my friend Andy Heitz.

In the beginning you are learning and outgrow kit quite quick, so unless money isn't a thing to take in account I would start with an production board like the Indiana, Fanatic or AK and once you are further in your learning curve you have an better idea what you actually want in a (custom) board.

Mojo Custom Boards in Hungary.
Shipping all around Europe.