Treating Saving Throws As Attack Rolls

I've realized for some time now that you could combine the saving throw table with the combat table by setting each saving throw category as the equivalent of an armor type and just using one table. But I never got around to working out the equivalents -- until now.

Fighter

Save Categories		Armor Equivalent
Death		Leather
Wands		Leather+Shield
Stone		Chain
Breath		Chain+Shield
Spells		Plate

Magic-User

Save Categories		Armor Equivalent
Death		Leather+Shield
Wands		Chain
Stone		Leather+Shield
Breath		Plate
Spells		Chain+Shield

(plus bonus vs. spells = Level/4, round down)

Cleric

Save Categories		Armor Equivalent
Death		Shield
Wands		Leather
Stone		Chain
Breath		Plate
Spells		Chain+Shield

Thieves save as either clerics or magic-users, depending on whether you are using OD&D, Holmes Basic, or one of the other Basic D&D versions, or you can construct a unique saving throw scheme by comparing the other classes (perhaps save as clerics vs. death magic and wands, but as fighters vs. everything else.

Notes:

1. I'm using "Death [Magic]" as the name of the first category rather than "Poison" to emphasize my opinion that the saving throw categories should be reserved for supernatural situations. I don't believe in using save vs. wands to dodge javelins, for example. Poison is such an extreme situation that it gets the benefit of being treated like death magic.
2. Magic-Users get the bonus to save vs. spells because in OD&D, they improve in this category faster than their other saving throws. A bonus equal to 25% of their level is a good approximation.