en_tn/1ch/28/19.md

I have put all this in writing

This is an idiom. Alternate translation: "I wrote all of this down" (See: rc://en/ta/man/translate/figs-idiom)

gave me to understand regarding the design

This refers to the detail for the design of the temple. Alternate translation: "helped me to understand the details for his temple" (See: rc://en/ta/man/translate/figs-explicit)