The layout plan of an excise factory should provide a comprehensive overview of the facility, indicating the specified purposes designated for different locations or areas. The plan must include a clear, scaled diagram showing various key elements such as production areas (including the placement of the equipments), loading and unloading bays, entrance and exit points, security guard house location, raw material storage area, raw material waste storage area, finished goods storage area, and staging area. Additionally, it should mark the locations of security measures like CCTVs and fire alarms.

Please note that specific requirements may vary depending on the type of excise goods being manufactured. For more detailed information on the Excise Factory Scheme and its requirements, please refer to the Singapore Customs website.