How perfect is Voynichese?

[oshfdk]

I've looked through past proposals that involved Roman numerals, the following one is very close, but it actually makes it even more destructive by summing the values of letters in each word and writing the result as a single Roman numeral (and then mapping to Voynichese glyphs). However, to make it a bit easier to tell apart different words, the letter values are not 1-23, but larger. The result actually looks quite similar to Voynichese:
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Some letter values:
t = 116
h = 104
e = 101
c = 99
a = 97

PLAINTEXT = "the cat sat on the mat"

the :: 321 :: [100, 100, 100, 10, 10, 1] 321 ['C', 'C', 'C', 'X', 'X', 'I']
cat :: 312 :: [100, 100, 100, 10, 1, 1] 312 ['C', 'C', 'C', 'X', 'I', 'I']
... etc ...

INTERMEDIATE = "CCCXXI CCCXII CCCXXVIII CCXXI CCCXXI CCCXXII" 

CIPHERTEXT = "chkem qoshol qokeriin qoem qokem qokeol"