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I had help for sure setting the units in place. As far as your suggestions, they are all great and would surely make an already great piece even better, so thank you! I've since sold my house and this unit stayed with the house but at the time it was going on 5 years now with the original piece and it still looks great and is holding strong! The new owners loved it as well!
And it looks fantastic! Going on 5 years and 1 move now and still holding strong!
You would have to double the 4x4 lengths and maybe add a shelf. My only concern would be the pedestal would maybe become top heavy.