Finally I got to add something to the boat!
On Sunday I managed to laminate both lateral extrusions, as planned. Experience is everything. Knowing what to do, how to do it and when, and being comfortable to handle all eventualities is something that comes only with repetition. Mentally going through all steps helps, but there is no substitute for own experience.
The epoxy resin has a gel-time of 30 minutes, which means, that you need to spread the resin evenly over the glassfiber-cloth within this timeframe. Still being inexperienced, and working on a complex surface with various planes made this a demanding task - which was accentuated by an exceptionally hot day, with an inclement sun burning on the roof over the lamination area. The radiation heat speeds up the gel-time of the epoxy.
I was not willing to give up another day of work and loose more time, so I went on with it. It was bit of a stressful operation. The first batch of epoxy heated up amazingly, and “gel-ed” within about 10 minutes! Now it happens that when you start laminating, you have to go all the way, there is no “PAUSE” button…
I was using the “wet layup” method, which I had learned with the boatbuilder. That means, that I roll epoxy onto the surface, then place the cloth over it, then roll epoxy over this again, and then squeegee it. This is a bit time-demanding, but works well on the almost vertical surfaces I had to do. Another drawback of this method is that the epoxy stays for longer time in the mixing bowl. Which means it heats up more, therefore cures faster…
Luckily I kept a cool head, and I had read the Gudgeon Brothers Book, lent by Gustavo, and learned there, that I could also use the “dry-method”, by which I just spread the epoxy over the layed-out cloth and then squeegee it. This goes faster and spreads the epoxy into smaller batches which keeps it cooler, extending the gel-time. But it doesn’t work on the vertical planes, because you can’t pour the epoxi.
Since the epoxy was gel-ing doubletime-quick, I adapted my methods and used both. The dry-method over the horizontal planes and wet-method over the vertical planes. This might have looked a bit hasty and clumsy, but worked well. And most important, the result was good. I managed to get a good lamination, and lost just a little bit of the first batch of epoxy.

I also marked the resin containers... just in case, you know...