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made an isolator board for the Soekris DAM1941 and the Raspberry Pi.
It provides isolated I2S and RS232 ports.

Also some Molex Pico-Blade connectors are there to provide connections to a IR receiver, a rotary encoder and a 10pin connector for some GPIOs for later use.

The project is under CC BY-SA 4.0 license. Feel free to make changes and spread it.
The files for KICAD version 5.1.9 are attached.

Parts List (RS-Components):
788-7609 Panasonic OS-CON, SMD Alu Kondensator, Elko radial 100μF ±20%, 16Vdc, Ø 6,3mm, –55 → +105 °C
903-8798 TDK, CGA, SMD MLCC, Vielschicht Keramikkondensator C0G, 100nF ±5% / 50V dc, Gehäuse 1206 (3216M)
823-2053 Silicon Labs Si8651BB-B-IS1, 5 Digital-Isolator, 2,5 kV 9,2 mA dc, SOIC 16-Pin
661-3778 Texas Instruments TLV1117-33IDCYR Positiv Low Drop Spannungsregler, SMD, 3,3 V / 800mA, SOT-223 3+Tab-Pin
807-1066 TE Connectivity CRGH SMD-Widerstand, 100Ω ±1%, Gehäuse 1206 (3216M)
832-3547 Amphenol T821 Leiterplatten-Stiftleiste Rechtwinklig, 12-polig / 2-reihig, Raster 2.54mm, Kabel-Platine,
832-3626 (2x) Amphenol T812 IDC-Steckverbinder Buchse, , 12-polig / 2-reihig, Raster 2.54mm
197-3377 Wurth Elektronik WR-CAB ribbon flat cable Flachbandkabel, 12-adrig AWG28, Raster 1.27mm, Länge 1m
674-2369 ASSMANN WSW Leiterplattenbuchse Gerade 40-polig / 2-reihig, Raster 2.54mm

optional (Connectors for IR-Receiver, Rotary Encoder, GPIO):
319-1092 Molex PicoBlade Leiterplatten-Stiftleiste Rechtwinklig, 3-polig / 1-reihig, Raster 1.25mm, Kabel-Platine,125-0730 (2x) Molex PicoBlade Kabel-Platine Steckverbinder, 3-polig Buchse / Buchse Raster 1.25mm, 300mm
279-9263 (2x) Molex PicoBlade Leiterplatten-Stiftleiste Gerade, 10-polig / 1-reihig, Raster 1.25mm, Kabel-Platine,
172-0143 Molex Kabel-Platine Steckverbinder, 10-polig Buchse / Buchse Raster 1.25mm, 300mm
708-5092 Vishay TSOP38438 Infrarot-Empfänger, 950Nm 38kHz, max. Bereich 45m

greetz
tonno