Transform R-Package to XLS-File

We often use an open-source R-Script (calculation, data, paramenters) to calculate THG-emissions of buildings. Our clients cannot handle R. We need exact the same functionalities, but in MS Excel (front-end with input-output, backend with calc, database, etc..
- Offer: make an offer in USD, overall capped cost, not per hour
- Payment: when it works, paypal, etc.
- Duration: 2 weeks
Thank you very much