In EU, musikding.de sells kits from various vendors. I bought a couple of PedalPCB kits with parts, enclosures drilled etc. Built myself the Browne Protein (each side a separate pedal) and Hudson Broadcast. They turned out pretty great in the end but I definitely had some issues.
- Musikding sent me momentary instead of latching footswitches by accident. They would have replaced them but I had already bought replacements so I asked for a future purchase discount instead. The latching and momentary 3PDT switches look identical so I can understand the mistake.
- The LEDs were extremely bright, think MXR level nonsense. I had to take some time to figure out the correct resistor value to dim them to a comfortable level. Different LED models will also require different resistor values.
- I had issues with the pedals working and definitely had to debug a good bit. PedalPCB didn't have schematics for the Protein at the time so I used the schematics for their Bluesbreaker and Nobels ODR-1 boards. They are probably like 80-90% the same as the Protein, just a bit different component values. I think in most cases the problem was with the 3PDT switch soldering, either on the switch or on the small cables going to the board.
For building, I highly recommend buying a good soldering station. It made a huge difference in how easy it is to solder the components together. I also bought a PCB holder to make it easier to handle. A magnifying glass meant for this stuff is also highly useful for inspecting your solder joints.
Do NOT buy any little PCBs that go on the footswitches! They seem convenient but are way more pain in the ass than manually soldering those together. When something didn't work, it was a nightmare debugging those tiny wires and the solder joints or trying to get the PCB off the switch.
When putting the board together, build with the smallest components first, then the next size up. Makes it easier if you have to go back in there to redo stuff. To make it a bit faster, consider where you can put a few components so you can easily solder them one after another. I had 2-4 components with their legs bent to hold them in place at once to solder. Then flip the board, put in more components and repeat.
I honestly should build more pedals as it was fun. I spraypainted and clearcoated mine, no labels or anything tho.
Most of the kits out there will be drive pedals and those are definitely easiest to start. Fuzzes especially are often minimal number of components.