About SDSI

We specialize in engineering super yacht interiors and SDSI is an experienced and flexible party to create solutions rapidly according the highest yacht building standards.

SDSI is located in the Netherlands close to several famous yacht- and interior builders. Since 1997 we have provided many services to luxury shipyards, carpenters, interior designers, naval architects, brokers and yacht owners of both classic and modern sailing and motor yachts in the forty to hundred plus meter.
From first sketch to complete production package, the SDSI team will create high quality drawing work and all other kinds of assistance, related to the interior engineering process.

Interior Engineering for Super Yachts

Creating the most beautiful and complex interiors requires teamwork. In close coorporation with co-makers of other technical disciplines SDSI always strives for the best solution.

SDSI can assist with the complete interior engineering process. The main services we provide are:

  • Technical GA and arrangement drawings
  • Detail engineering
  • 3D netspace / boxdrawings
  • Interdisciplinary checks and technical overviews
  • Assembly “1:20” drawings
  • Complete production packages incl. CNC files (CAD/CAM).

Apart from the high-accurate engineering, our dedicated team offers full service and assistance during the project. Managing the process with clear communication and reports to our clients.

Please feel free to contact us if you have any questions.

History of SDSI – Super Yacht Interior Engineers

Our company ‘Van Dongen SDSI” was launched in 1997. The SDSI brand stands for Support, Design, Styling and Illustration. Founder Erik van Dongen’s education is in naval architecture. He started his career at Hoek Design in the early 1990’s. SDSI’s first assignment was a multi-disciplinary project that included sail plans, engine systems, deck arrangements, rigging configurations and interiors.

SDSI’s services eventually evolved into engineering specialising in Super Yachts Interiors. SDSI has grown out to a full-service interior yacht engineering studio. A dedicated crew of 17 professionals strive to excel in their job.

Future vision of SDSI

SDSI is growing and exploring new territories. While listening to our client’s needs, we constantly innovate and think beyond boundaries, exploring new possibilities. Keeping in mind costs and technical aspects.


“For me working with SDSI is a guaranty for working in a professional team with a lot of knowhow and experience
so even the most challenging project will be completed conform the owners’ dream.

Leendert Vink - Project Engineer

Meet our team