ChangePlan Ltd formed a close and long-standing working partnership with Byrum UK Ltd (now Byrumlabflex Ltd), in providing laboratory & hospital storage systems across the UK and internationally. We developed a bespoke Autocad application extension (using menu customisation, autolisp, activeX, etc.) to build a library of their range in 2D and full 3D to enable designers to quickly and efficiently produce 2D & 3D layouts. From the start (using Autocad r10) we modelled all parts, using layers to separate the 2D representation (symbol) and the full 3D accurate model, allowing draughtsman to work on 2D plans, whilst still producing the full 3D layout. Accuracy is key, when installing precision manufactured units, and with routines controling then placement of frames, worktops, and units, ensured complete accuracy, enabling conflicts to be identified in the design process. Elevations and views were then accesible instantly from the model ensuring accuracy and a true interpretation to the client of the end result. This has evolved into the parts being used for accurate visualisations at the onset of the design process, ensuring the client can see, in full detail, the intended design and can make, previously prohibitive, revisions to their concepts without the usual costs, delays, and waste. An additional drawing management system was developed, allowing accurate tracking and time costing of drawings against projects and cost centres within a central database. Also, due to the nature of their particular field, the application can grow and be extended in house as more and new products are taken on by the company, giving them full control, and allowing the business to grow. Bespoke software development offer many unseen benfits.