I started out my eurorack with drum modules. It was more a drum machine then a synth. But when the hexinverters clap failed to startup and the snare wasn’t what I tough it would be I started building other modules. But I found myself always looking for more drum sounds. The snare and clap where missing quite a long time from my setup until Weston released the AD110. This would surely fit my needs for a good clap and snare, and it did. The modules also comes with a bass drum, cymbal and hithat. It’s a all in one drum machine. Based on the Korg DDM-110. It has some modifications but sound oldskool and good. The manual is well documented.
https://westonaudio.com/ad110.html
Difficulty to build: Medium, some may find it hard. Has multiple pcb’s, can take up some time but well ordered and spaced