Re: I don't want to make FATAL 2nd Edition
As long as you don't plan on putting in mechanisms like what happens when the circumference of "Tab A" is greater than the elastic limit of "Slot B", you will be safely out of FATAL territory.
Other than that, I'd say don't try to to design your system in a vacuum. Stand on the shoulders of giants. Look at earlier systems similar to yours. It doesn't matter if it was successful or not, they will tell you things you want and don't want in your system.
Bravo on choosing a nice, solid, simple basic mechanic like D100 vs TN. Let the innovation be in your content, not your randomizing tool
Other than that, playtest, playtest, playtest the stuffing out of that system.
(And if your system does make it big, I'd love a mention on your 25th anniversary deluxe edition :) )
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“Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.”
- Robert E Howard, "The Tower of the Elephant"
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