How to make this cube edges fully G2?

Hi,
I want to fillet this cube with G2 continuity. I used Blend tool to fillet it but lower corners were not good enough so I decided to create them manually. I split the fillet surfaces as you see (split isocurve) and now I don’t know how to continue.
Please help me.
1.3dm (620.6 KB)

There are several posts on how to do this. It’s meticulous time consuming work and completely pointless. Setback fillets should never be seen. They’re meant to deal with unavoidably messed up intersecting surface areas. Just blast through them with G1 fillets with Fusion360 or solidworks.

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Finally, I found a good solution. The render seems acceptable result.
1.3dm (2.0 MB)