Of course "I too can do it".
I don't see how you're getting yours though, but that could be because you're using some fancy artificer trick. Are you sure you don't have more than 13000 gp worth of equipment?
As for the alter self, I know of no +20 natural armor form. (It must be fairly new?) I'm using a +18 one in my build below. (Quick work, may have bugs.) It can only pull off the listed AC once/day, but then again you don't really
need AC 63 most of the time...
Sun Elf Monk1/Wizard5*
*Focused Transmutation Specialist (CMag), Necromancy, Illusion and Evocation (Or Enchantment) Banned
Otherworldly (PGtF), Carmendine Monk (CoV), Practiced Spellcaster (CDiv), Extend Spell
Base ability scores:
Dex 16
Int 20
Spells:
Level 3 (2+2): Greater Mage Armor (SC), Dragonskin (SC), 2 more
Level 2 (3+2): Fox's Cunning, Cat's Grace, Alter Self, 2x Heroics (SC)
Level 1 (5+2): Shield, Protection from Evil, 5 more
Alter self into dwarf ancestor from MMIV:
https://wizards.com/default.asp?x=dnd/ex/20060704a&page=3 . Use Ring of Shrinking. Heroics for Dodge and Combat Expertise. (Could add more +AC feats by extending 2nd level spells into third level slots.)
AC:
10
+18 natural armor (dwarf ancestor)
+3 enhancement natural armor (dragonskin)
+6 Dex (16 + 4 cat's grace + 2 ring of shrinking)
+7 Int (20 + 4 fox's cunning)
+6 armor (greater mage armor)
(50)
+4 shield (shield)
+3 dodge (fight defensively, 5 ranks tumble)
+2 dodge (Combat Expertise)
+1 dodge (Dodge)
(60)
+1 insight (ioun stone)
+2 deflection (protection from evil)
= AC 63
You could add more under special circumstances, using cover, aid another or the Mobility feat. No ring means -2 AC. No protection from evil is -1 (since he could afford a Ring of Protection +1.)
Gear (13000 gp max)
5000 Dusty Rose Ioun Stone
3600 Ring of Shrinking (Savage Species)
Spells
"Other"
(Tricksy stuff not included: Using scintillating scales to turn natural armor into a deflection bonus, then changing into new form with natural armor. Or spending 1200 gp to have a high level wizard cast polymorph any object on you.)