6:18a The cedar paneling inside the temple was carved with gourds and open flowers.

Cedar wood ⌊covered⌋ the inside of the house. Gourds and flowers in bloom/blossom were carved into it.
-or-

⌊Workmen⌋ ⌊lined/paneled⌋ the inside of the house with cedar wood. They carved images of gourd vines with flower blossoms into the wood.

6:18b Everything was cedar; not a stone could be seen.

It was all cedar. No stone could be seen.
-or-
Everything in the house that you/one could see was ⌊covered with⌋ cedar. There was no stone visible.

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