The item you are searching for is a traditional printed paper model sheet that builders cut out and assemble.
If you are looking to build this specific 1:250 scale model of the Type 143 Schnellboot, you can source it through legal, physical channels: Download WHM 1243 Schnellboot Typ 143 zip
⚠️ for " WHM 1243 Schnellboot Typ 143 The item you are searching for is a
Communities like Kartonbau.de often have buy/sell/trade sections where hobbyists trade out-of-print WHM sheets. you can source it through legal