In the Monster Creation section, Microlite20 states, "Add stat bonuses to suit and as logic dictates."
I could come up with each monster's stats individually as I use them, but doing this well seems like it might take more effort and experimentation (not to mention time) than I want, not having GMed 3.5 before. The monsters in the M20 core are heavily influenced by the d20 SRD, and the two systems are meant to be generally compatible. Pulling stats from the d20 SRD seems like a good place to start.
The problem I'm running into is that M20 only has three stats, and d20 has six. I'd like to know if anyone has experience with a functional, across-the-board method for boiling d20 monster stats down into just Strength, Dexterity, and Mind. The goal here is to keep the monsters roughly the same type and intensity of challenge as they are in the d20 SRD, although I know it may not always be 1:1.
I'm primarily using the core and the Purest Essence documents, but I can consider material from other M20 variants, provided they're compatible with the core. Tested house rules are also acceptable.