BRRRR Calculator Suggestion

[Kyle M.]

First, I'd like to thank BiggerPockets for the tools and resources they provide to their members. It really makes investing in real estate easier. 

Suggestion, or if someone knows how to do this please let me know, I'm running the numbers on a mobile home park that I'm planning on BRRRRing. 

The issue I'm having with the calculator is that it doesn't have an option for adding or subtracting units after the rehab. For instance I'm planning on adding about 20 spaces to the park. I can go ahead and plug in the total spaces with the revenue at the beginning but then my numbers are too high for cash flow, ect when I purchase it. It could be splitting hairs here but I'm planning on presenting it to my lenders and want everything to look straight. 

Any help with be great.