Excellent posts!
Based on a number of suggestions (Geno, Rip, others) it seems that at least for something that we could put in a "How to Start Being an EM-F-er" guide book, we could layout the following classes.
Stock/Standard (3.3 class) These are figures originally designed for the hobby in their basic state. Customs can be included with additions of facemasks and accessories as long as the overall weight doesn't exceed 3.3.
Or should it just be stock, no changes or modifications other than paint, facemasks, chinstraps. (the essentials)? Maybe Stock comes in 2 classes?
Modified at 4.0
Unlimited
I would like to turn the discussion to definitions for the 3 or 4 classes.
Then we can start talking about height, width standards.

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EM-F-er [ěm -f-er] –
noun-abr-slang: Electric Miniature Footballer
1. a person/hobbyist/gamer who creates a representation of American Football in a small or reduced scale for competition or show.
2. the majority of forum users on the website,
www.miniaturefootball.org
—Idiom
3.
One Bad Em-F-er, negative shout out; pertaining to weirdwolf:
There goes one bad EM-F-er. I mean he can’t play and ain’t never win nothin’!