YOU SAID:

While I was finishing it I discovered I had assembled part A upside-down. Oops.

INTO JAPANESE

仕上げている間、私は部品Aを逆さまに組み立てていることに気付きました。おっと。

BACK INTO ENGLISH

While finishing, I noticed that I was assembling part A upside down. Oops.

INTO JAPANESE

仕上がりながら、A部を逆さまに組み立てているのに気がつきました。おっと。

BACK INTO ENGLISH

While finishing, I noticed that the A part was assembled upside down. Oops.

INTO JAPANESE

仕上がり途中、Aパーツが逆さまに組み立てられているのに気付きました。おっと。

BACK INTO ENGLISH

During the workmanship, I noticed that the A parts were assembled upside down. Oops.

INTO JAPANESE

仕上がりの最中に、Aパーツが逆さまに組み立てられていることに気付きました。おっと。

BACK INTO ENGLISH

During the workmanship, I noticed that the A parts were assembled upside down. Oops.