3D interactive apartment building that shows floorplans

Hi,

I’ve created a tool that makes it easier to compare apartments within a new development (screenshot attached). Watch concept video to see how it works:
In the concept, the building image is a render that I’ve applied a highlight over to represent available apartments. However, what would be better is if the building could be made in Unreal that is interactive.

Would be interested to get some ideas on what sort of interactions might be possible and what the time required and cost might be.

Thanks,