Covert VBA Excel Add-ins to VB.NET

I have developed a series of Excel Add-ins in VBA and need them converted to a single .NET add-in. Although the add-ins I have developed are functional, my VBA skills are not very good, and therefore the code needs completely de-bugging, and possibly re-writing if the tasks can be accomplished more efficiently. Potential for substantial further work if the project is completed to a satisfactory standard and on time. Please see the attached doc for further details.