Converting Swords & Wizardry Challenge Level to AD&D/OSRIC Dungeon Level Table

The Why
I'm trying to hack together some Over-The-Top Encounter By Dungeon Level Tables utilizing the material from all of the OSR Monster Books I have (The Swords & Wizardry Monster Book; Monster of Myth; Malevolent and Benign; and The Tome of Horrors Complete).
However, whereas AD&D/OSRIC categorizes monsters into a scale of I through to X for "Dungeon Level", Swords & Wizardry utilizes a Challenge Level scale that is analogous to the monster's hit dice, but adjusted for special abilities, so it's a more granular and also an open-ended scale.

The How
In the 1st edition Dungeon Masters Guide, in Appendix C: Random Monster Encounters on page 174, there is a table for determining appropriate dungeon levels for random monster encounters by use of it's experience value, such as III: 51-150 X.P. and IX: 5,501-10,000 X.P.
Obviously it's easier to convert from the more granular and open-ended Challenge Level scale to the restrained and smaller AD&D scale.
Now, as previously mentioned, the Swords & Wizardry Challenge Level is determined by a monsters Hit Dice (with adjustments for special abilities), so what I did was use the Experience Points Value of Monsters table from page 85 of the Dungeon Masters Guide to determine the "Dungeon Level" of a monster of average hit points and no special abilities for Hit Dice of 1 through to 21; after 21 I had to use some fancier math to determine at what Hit Dice an unspecial monster would need to Break the Dungeon Level X threshhold (31.7524 Hit Dice).
Interestingly enough according to this scheme the only monster in the Swords & Wizardry Monster Book that qualifies for Dungeon Level X is Orcus, Demon Prince of the Undead, which is actually in line with the AD&D tables. All of the CL 32+ monsters in the Tome of Horrors Complete are pretty much in line with the over-the-top nature of Level X AD&D Dungeon Monsters as well. When comparing some S&W version of monsters and their CL to their AD&D analogues and their Dungeon Levels they either match up or are off by 1 level, so this system is close enough for me.

S&W Challenge Ratings by AD&D/OSRIC Dungeon Levels
AD&D - S&W
I - 1
II - 2
III - 3,4
IV - 5
V - 6,7
VI - 8
VII - 9-14
VIII - 15-18
IX - 19-31
X - 32+

Fat Cotton Knocks Another One Out Of The Park & AD&D Spell Analysis Request

Another great piece by Fat Cotton, this time for Fight On! magazine...between FO and Petty Gods I'm thrilled to see folks availing themselves of his surreal, whimsical talents!

Also, does anyone know of any online analysis of AD&D spells and their casting times? With all the hobbyist Gygaxian research floating around on the net, someone must have done the number crunching regarding AD&D spells and how many segments it takes to cast them? The discussion regarding The Black Lasher made me realize that I need to include AD&D/OSRIC information with the Gramaree spells in order for full-universal-oldschool D&D utility.