You are missing the point.
None of that can be added. It's not an fp. It doesn't even have a hotshot and there's no EVF nor 'everything else' as add-on.
Only changeable things are L-mount lens and battery
None of that can be added. It's not an fp. It doesn't even have a hotshot and there's no EVF nor 'everything else' as add-on.
Only changeable things are L-mount lens and battery
They also offer two other sensor LEGOs: one that looks like a previous/heaper gen (fp) and other with high-res 60+ MP sensor ("fp L").
I like the idea.