That is an excellent question, Avi. Rav Shlomo Efraim from Lontshetz, who is known to us as the Keli Yakar, asks the very same question. The Aron Kodesh represents Torah, the source of a person's spiritual growth. Yes, but there are certain conditions. As you said, Avi, the measurements of the Aron Kodesh are all fractions.
Fractions are incomplete numbers.
We look for an area where we can improve. Let us take patience, for example. It is surely an area where I could improve. There are many essays written by our great Rabbis about the virtues of patience. They also give techniques how to become more tolerant.