Code conversion from VB.NET to PHP/NuSOAP

We have a GPS tracking application (using Google Maps API) which is currently written in ASP.NET (VB.NET), primarily using Web Services and Stored Procedures. At present, it is very Microsoft-centric, being written specifically for Win 2003 Svr, IIS and MS SQL Server. We would like to change this application to instead use PHP/Apache/MySQL/NuSOAP to be more platform independant. Additionally, we would need to add Web Report Generation functionality to the application where it does not currently exist. This may be via an inexpensive (or free) third party application. Obviously, the conversion would include the core code, web services and database (including stored procedures). We are keen to work with a professional who is capable of performing this task and importantly, able to complete the project quickly. Full source code is obviously available. By far the largest code portion is the Web Services (at 13,000 lines), while the main code is a fraction of this.