More than 1 answer.

Remember it looks like a cube. That should help with the last few squares.

Fun, completely logical puzzle. There may be more than one POSSIBLE answer...but if you are trying to make a CUBE there is really only one way to do it correctly! Thanks for the fun! ~:)

SPOILER:
Start the '11'-s from the up right and the down left corners.

Mostly solved itself :)

Thanks.

Thank you.