As Superpilot said this is bespoke development although there may be some existing apps out there which will allow you to configure an individual aircraft.
From a web perspective it can easily be done in any number of frameworks including responsive design for laptop/tablet/mobile. This is one I did for my personal use as a little side project in HTML/Javascript/PHP which hopefully gives you an idea of what's possible. I wanted to be able to quickly drag and drop different pieces of gear on to the outline and then just add weights to calculate a CG envelope diagram and raw data. All the other graphics etc are pretty straight forward. Hybrid apps and responsive frameworks mean you don't even need specific ios or android programming skills (swift or java). In terms of porting to excel, that's possible as well but probably would require some vba support to provide all functionality.
