I have read your project description and understood. I have built such server application before.
Since 2000 I am working on Visual Basic (VB6 and VB.NET) and MSSQL, and MS Access MDB. So more than 20 years of experience in Visual Basic to build any kinds of Windows application. I have created Point of Sales, Inventory, Accounting, Back Office, Hardware Controller System, etc. If you need a good delivery of job and move this project to successful then message me, please.