## 1 Introduction  
According to previous research activities [1], the construction industry is characterized as one of the less efficient industries on the market, and the productivity gap with other industries has been growing over the last decade. The construction industry is characterized by highly customized products and components that increase the complexity of the information and material flow [2; 3]. With a development toward an escalating number of individual product variants and product configurations, the need for adaptable production and the complexity of manufacturing processes and systems increase simultaneously. Manufacturing systems in a mass-customization environment should be able to produce small quantities in a highly flexible way and should be rapidly reconfigurable [4; 5]. The latest trends in mass customization are the concepts of \"Industry 4.0\" or \"cyber-physical systems\" (CPS). Industry 4.0 can be understood as the development toward more digitization and automation in production [6]. The term CPS describes particularly the continuously growing integration of information and communication technology (ICT) with physical real-world entities. The large potential of Industry 4.0 will be a key enabler for further developments in mass-customization manufacturing [7]. This paper extends the work published in [8] to investigate strategies for the digital transformation of the information flow and business processes of a configure-to-order (CtO) service provider as a local industry partner. This industry partner designs and configures temporary container facilities according to individual customer needs. We extend our previous work by presenting more findings obtained in the pilot project and an in-depth discussion on applicability and utility with respect to practical implementations. As outlined by [PERSON] [9], the information flow in construction projects has to be considered the core element for planning and controlling the production in an industrialized environment. The industry partner involved in this study belongs to the construction equipment industry, which, compared to the main construction industry, has had even less contact with Industry 4.0 concepts. Even though research [10] shows that the discussion about the adaptation of Industry 4.0 in construction has not yet been finished, in this sector the method of Building Information Modeling (BIM) plays the role of enabling Industry 4.0 ideas [1; 3; 10]. BIM describes a method of cross-linked planning, construction, and operation of buildings, infrastructures, and industrial facilities using software [11]. Its significance as an Industry 4.0 enabler is mainly due to the reason that BIM, as the representative of digital twinning in the construction industry [12], can provide for the digital characterization and hence the information basis of all relevant physical and functional properties of construction projects [13]. This in turn, comprises the starting point for any digital construction site support. In particular, BIM is crucial for the interplay of digital and nondigital entities, and thus essential for the establishment of cyber-physical production systems in construction [10], through which manufacturing processes are already positively affected [14]. Taking advantage of the BIM approach, the authors suggest a digital process flow using computational design and digital fabrication techniques to enhance the automation and the efficiency of the information flow in selected business processes. Digital fabrication refers to production processes controlled by computers. The business processes considered here refer to a customized product in a container construction pilot project and comprise all interrelated activities from capturing the customer requirements to the bid estimation and work preparation phase. Figure 1 shows the technique applied in this study (b) in comparison to the schema of conventional computational design (a) by [PERSON] et al.