The margins of this mezuzah turned out particularly well in that there is no stretching of letters, and I didn't have to compromise the straightness of the left margin in order to ensure proportionality. While according to halakhah it is generally much more preferable to have uneven line lengths in a mezuzah than it is to stretch any letter out proportion (I hope to cover this in a later post), people are not used to seeing less than 100% margin justification, and so for professional reasons it's best if the mezuzah turns out to have both proportional letters and justification.
Other points as regards this mezuzah, and others I write:
אמר רבא שבעה אותיות צריכות שלשה זיונין ואלו הן שעטנ"ז ג"ץ
Many are used to seeing שלושה זיינין as built-in features of these letters, rather than as decorations meant for the special occasion of a mezuzah, but Ramba"m (and, consequently, nusah Teiman) takes Rava's words as indicating specific letters and specifically for a mezuzah (הלכות תפילין ומזוזה וספר תורה פ' ה הלכה ג). On this point, R. Qapah writes that this means that early sifrei torah would not have had any at all.
Note that שלושה זיינין are not to be confused with תגין, little upticks to the horizontal stroke of many letters (such as ה), which are indeed intrinsic to the letter in question rather than an occasional addition.
Image of the whole mezuzah (note there are no נגיעות in the actual mezuzah; the bend in the qelaf creates this illusion in places).