All 51 resistors are mounted, except P3, the AF control.
The next step are the capacitors. I'm lucky that I didn't continue directly with it.
Today I got a email from Javier,EA3GCY, the developer of this kit. In this email he write that it's better to use 12 pF for the capacitors C15 to C19, instead of 22pF. With the value of 22pF the IF bandwidth is below 2KHz. Properly to small for SSB.
Thanks for this advice Javier!
73, Tjeerd (Gose) - PA3GNZ