Engineering your own voynich

[mja0075]

The text below is a ciphered (by me) text in Latin. It is a substitutional cipher with nulls, functional symbols and some rules, spaces are false. 
...

Just to round out this thread

plaintext

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Tertius Abrotano legitur gradus esse caloris,
et desiccandi semen ferventius herba est,
unde juvat nervos et causas pectoris omnes,
illius elixi si sit decoctio sumpta.
Sic quoque dysnoicis prodest tussimque repellit, 
et prodest lumbis, sic vulvarumque querelis.
Omnibus his crudum cum vino proderit haustum,
urinam purgat sic et praecordia mundat,
sic curat sciasim, sic sumptum menstrua purgat,
serpentes nidore fugat, bibitumque venena 
illorum extinguit, sedat quoque frigora febris
antea quam veniant si mixto sumitur amne


Source: You are not allowed to view links. Register or Login to view. Section 2

key (incomplete):

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Got a run that found the y=null and it fell apart from there...
Sorry, I don't have time to finish the key completely today (Perhaps Searcher can post? or someone else can figure it out fully) but it's something like:


"y" is null
"f" might be null


key = {
    0: {
        "a": "a",
        "b": "cth",
        "c": "k",
        "d": "s",
        "e": ["ee", "e", "ai"],
        "f": "",
        "g": "ckh",
        "h": "cfh",
        "i": "ch",
        "j": "iiin",
        "k": "",
        "l": "ok",
        "m": "n",
        "n": "d",
        "o": "o",
        "p": "",
        "q": "?",
        "r": "r",
        "s": ["g","l"],
        "t": "t",
        "u": ["aii","sh"],
        "v": "",
        "w": "",
        "x": "?",
        "y": "",
    },
}