Bylma Assembly, part of MONSTER ARCHIEF, is a collaborative artistic research project in collaboration with artist Siem de Boer. In the project, we aim to make reconstructions of the (now-gone) Borg Bylma, which once housed Rudolph de Mepsche. The project started with digitalizing archaeological photographs, drawings, writings and artefacts of the 1957 excavations of this building, from the collections of NAD Nuis and Rijksdienst Cultureel Erfgoed. After this, we collaborated with archaeologist Sanne Folgerts, as well as other experts, to further the interpretation of these materials. In our project, we reconstruct the house, as well as questioning our methodologies of reconstruction.