@polyboy
May be I should have checked here earlier 
and I might have saved a couple of hours.
I was trying and came up with a solution almost similar to yours.
I do not know if the mold I made is printable but I was able to achieve almost close to what I set out for. (attaching a screenshot)
@polyboy & @chrisd
I appreciate your inputs and time. Thank you.
Still experimenting … and learning …