Excel Debt Model Enhancement

I have already built a first-pass loan and debt workbook in Excel. Before I roll it out, I need a fresh set of expert eyes to (1) audit every formula and assumption, and (2) push the file much further with VBA macros... (Budget: £250 - £750 GBP, Jobs: Data Analysis, Documentation, Excel, Excel Macros, Excel VBA, Financial Analysis, Financial Modeling, VB.NET, Visual Basic, Visual Basic for Apps)