Finally, after waiting for all the parts to arrive from all around the world, i build my very first Keyboard. Details about which parts I use can be found in Part 1 of this Post.
Assembling everything together was easier than i thought. Worst part was that i misplaced the switches of the bottom row. There were for each switch multiple holes right next to each other and i choose the wrong one for the Ctrl, Win and Alt-Key. Desolder them was difficult because the soldering tin was deep down in the PCB-hole and didn’t want to get out. Another issue is the stabiliser of the Backspace-key, something is wrong with it and it got stuck when pressing the key, I ended up just removing the stabiliser there because its steady enough without it.
I’m still missing the Wood-Case, that will come as soon as my dad has the time to help me make it. For the time being I just used a plank and screwed the board on it. There is already a Firmware on the PCB, but it will be replaced with a customised version of the TMK-Firmware.