Homemade Metal Armor in SW2.5

(Strength - 3(n+a))/6 (rounded down) + Rank Bonus + Fixed Value 4 + Magic Armor 1 + a (already included in the calculation result)
n = Evasion Modifier (minimum -3, maximum 0)
a = Manatite Enhancement (Yes = 1, No = 0)

*The cost of Manaite processing must be paid separately.
*PCs with Strength of 3 or lower cannot undergo Manaite processing.

Advantages: Fits the game’s world-building.

Disadvantages: The calculation formula becomes complex.
　　　　　: Depending on the PC’s Strength, simply applying Manaite processing may not increase the armor’s defense points.

For example, when crafting metal armor with Strength 15, Rank A, and n = Evasion Modifier 0:

(15 − 3n)/6 (rounded down) + Rank A + fixed value 4
Since the Evasion Modifier is 0, substitute 0 for n
= (15 − 0)/6 + 1 + 4
= 2 + 1 + 4. Add the +1 evasion bonus from the magical armor, so

Defense Points: 8
Evasion: 0

*Note: The +1 evasion bonus from the magical armor is not included in the calculation, so please add it to the result above.

Rank Bonuses
B = 0
A = 1
S = 2
SS = 5