Doom is armorless and kills Fisk's prized white tiger and uses it's skin to cloth himself. He eases through his guards with nerve strikes and swift punches to the throats. Once he makes it to the top he faces off against the Kingpin himself in a little h2h.
1st scenario Standard Kingpin vs Doom.
2nd scenario Classic Kingpin vs Doom
For arguments sake his upgrade did not give him any increased strength or anything.
Classic Kingpin has the advantage over Doom in every aspect, except intelligence.
Skill, speed, strength, durability... Doom without his armor will be crushed by someone who was stronger and faster reflexes than even Classic Spider-Man.
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"Farewell, Damos... Ash, Pikachu... And you. All of my beloved." -- Arceus